diff --git a/README.md b/README.md
index ccd6ef1..7827381 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,22 @@ The updating screen provides a form for updating an existing `Move`.
 
 <img src="./docs/update.png" width="410" style="margin:20px" alt="">>
 
+## Some business logic
+
+While the back end doesn't forbid a `Move` from being both weak against and effective against the same one type,
+it should. That's one of the flaws of that API.
+
+In this app, we did implement the business logic described above in our callbacks for our `MultiSelect` elements, like
+so:
+
+```typescript
+const handleSelectType = (selectedTypes: string[], setTypes: React.Dispatch<React.SetStateAction<string[]>>, otherSelectedTypes: string[]) => {
+    const uniqueSelectedTypes = Array.from(new Set(selectedTypes));
+    const withoutDuplicatesFromOtherColumn = uniqueSelectedTypes.filter(type => !otherSelectedTypes.includes(type));
+    setTypes(withoutDuplicatesFromOtherColumn);
+};
+```
+
 ## Using the app
 
 ### Running the backend
@@ -94,10 +110,10 @@ In order to use this app, you will need to run the dedicated backend. A `README`
 with [instructions](https://github.com/draialexis/pokemong_api#user-content-prep-steps) is provided
 for that purpose.
 
-###  Connecting to the backend locally
+### Connecting to the backend locally
 
 First, please find the `config.ts` file at the root of this project, and replace ~~`192.168.0.15`~~
-with the IPv4 address associated with your own Wi-Fi adapter. 
+with the IPv4 address associated with your own Wi-Fi adapter.
 
 To find that address out, you can run `ipconfig` on Windows or `ifconfig` on macOS/Linux in your terminal.
 
diff --git a/screens/moves/MoveFormScreen.tsx b/screens/moves/MoveFormScreen.tsx
index 576ffe6..d581a3f 100644
--- a/screens/moves/MoveFormScreen.tsx
+++ b/screens/moves/MoveFormScreen.tsx
@@ -1,23 +1,32 @@
 // screens/moves/MoveFormScreen.tsx
 
-import React, { useEffect, useState }          from 'react';
-import { Button, StyleSheet, Text, TextInput } from 'react-native';
-import { StackNavigationProp }                 from '@react-navigation/stack';
-import { RootStackParamList }                  from "../../navigation/navigationTypes";
-import { useDispatch, useSelector }            from 'react-redux';
-import { createMove, updateMove }              from '../../redux/actions/moveActions';
-import { AppDispatch, RootState }              from "../../redux/store";
-import { Move }                                from "../../entities/Move";
-import { RouteProp }                           from "@react-navigation/native";
-import { MOVE_FORM }                           from "../../navigation/constants";
-import { Picker }                              from "@react-native-community/picker";
-import { ItemValue }                           from "@react-native-community/picker/typings/Picker";
-import { MoveCategoryName }                    from "../../entities/MoveCategoryName";
-import { TypeName }                            from "../../entities/TypeName";
-import MultiSelect                             from "react-native-multiple-select";
-import { KeyboardAwareScrollView }             from "react-native-keyboard-aware-scroll-view";
-import AlertModal                              from "../../components/AlertModal";
-import { MOVE_ERROR }                          from "../../redux/constants";
+import React, { useEffect, useState } from 'react';
+import {
+    Button,
+    KeyboardAvoidingView,
+    Modal,
+    Platform,
+    ScrollView,
+    StyleSheet,
+    Text,
+    TextInput,
+    View
+} from 'react-native';
+import { StackNavigationProp } from '@react-navigation/stack';
+import { RootStackParamList } from "../../navigation/navigationTypes";
+import { useDispatch, useSelector } from 'react-redux';
+import { createMove, updateMove } from '../../redux/actions/moveActions';
+import { AppDispatch, RootState } from "../../redux/store";
+import { Move } from "../../entities/Move";
+import { RouteProp } from "@react-navigation/native";
+import { MOVE_FORM } from "../../navigation/constants";
+import { Picker } from "@react-native-community/picker";
+import { ItemValue } from "@react-native-community/picker/typings/Picker";
+import { MoveCategoryName } from "../../entities/MoveCategoryName";
+import { TypeName } from "../../entities/TypeName";
+import MultiSelect from "react-native-multiple-select";
+import AlertModal from "../../components/AlertModal";
+import { MOVE_ERROR } from "../../redux/constants";
 
 type MoveFormScreenNavigationProp = StackNavigationProp<RootStackParamList, typeof MOVE_FORM>;
 type MoveFormScreenRouteProp = RouteProp<RootStackParamList, typeof MOVE_FORM>;
@@ -50,6 +59,14 @@ const MoveFormScreen = ({ navigation, route }: Props) => {
         });
     }, [navigation, route.params?.move]);
 
+    const [isModalVisible, setModalVisible] = useState(false);
+    const [currentMultiSelect, setCurrentMultiSelect] = useState<'weakAgainst' | 'effectiveAgainst'>('weakAgainst');
+
+    const handleOpenModal = (multiSelect: 'weakAgainst' | 'effectiveAgainst') => {
+        setCurrentMultiSelect(multiSelect);
+        setModalVisible(true);
+    };
+
     const [selectedWeakAgainst, setSelectedWeakAgainst] = useState<string[]>(move.type.weakAgainst);
     const [selectedEffectiveAgainst, setSelectedEffectiveAgainst] = useState<string[]>(move.type.effectiveAgainst);
 
@@ -76,89 +93,113 @@ const MoveFormScreen = ({ navigation, route }: Props) => {
     };
 
     return (
-        <KeyboardAwareScrollView style={styles.container}>
-            <AlertModal
-                visible={!!error}
-                message={error || ''}
-                onClose={() => dispatch({ type: MOVE_ERROR, payload: null })}
-            />
-            <Text style={styles.label}>Name: </Text>
-            <TextInput
-                value={move.name}
-                onChangeText={(text) => setMove({ ...move, name: text })}
-                style={styles.input}
-            />
-            <Text style={styles.label}>Category: </Text>
-            <Picker
-                selectedValue={move.category}
-                style={styles.input}
-                onValueChange={(itemValue: ItemValue) =>
-                    setMove({ ...move, category: itemValue as MoveCategoryName })
-                }>
-                {Object.values(MoveCategoryName).map((value) =>
-                    <Picker.Item key={value} label={value} value={value}/>
-                )}
-            </Picker>
-            <Text style={styles.label}>Power: </Text>
-            <TextInput
-                value={move.power.toString()}
-                onChangeText={(text) => {
-                    if (!isNaN(Number(text))) {
-                        setMove({ ...move, power: Number(text) });
-                    }
-                }}
-                style={styles.input}
-                keyboardType="numeric"
-            />
-            <Text style={styles.label}>Accuracy: </Text>
-            <TextInput
-                value={move.accuracy.toString()}
-                onChangeText={(text) => {
-                    if (!isNaN(Number(text))) {
-                        setMove({ ...move, accuracy: Number(text) });
-                    }
-                }}
-                style={styles.input}
-                keyboardType="numeric"
-            />
-            <Text style={styles.label}>Type: </Text>
-            <Picker
-                selectedValue={move.type.name}
-                style={styles.input}
-                onValueChange={(itemValue: ItemValue) =>
-                    setMove({ ...move, type: { ...move.type, name: itemValue as TypeName } })
-                }>
-                {Object.values(TypeName).map((value) =>
-                    <Picker.Item key={value} label={value} value={value}/>
-                )}
-            </Picker>
-            <Text style={styles.label}>Weak Against: </Text>
-            <MultiSelect
-                items={
-                    Object.values(TypeName).map((value) => ({ id: value, name: value }))
-                }
-                uniqueKey="id"
-                onSelectedItemsChange={
-                    (selectedItems) => handleSelectType(selectedItems, setSelectedWeakAgainst, selectedEffectiveAgainst)
-                }
-                selectedItems={selectedWeakAgainst}
-                displayKey="name"
-            />
-            <Text style={styles.label}>Effective Against: </Text>
-            <MultiSelect
-                items={
-                    Object.values(TypeName).map((value) => ({ id: value, name: value }))
-                }
-                uniqueKey="id"
-                onSelectedItemsChange={
-                    (selectedItems) => handleSelectType(selectedItems, setSelectedEffectiveAgainst, selectedWeakAgainst)
-                }
-                selectedItems={selectedEffectiveAgainst}
-                displayKey="name"
-            />
-            <Button title="Save" onPress={handleSave}/>
-
-        </KeyboardAwareScrollView>
+        <KeyboardAvoidingView
+            style={styles.container}
+            behavior={Platform.OS === "ios" ? "padding" : "height"}
+        >
+            <ScrollView contentContainerStyle={{ paddingBottom: 20 }}>
+                <AlertModal
+                    visible={!!error}
+                    message={error || ''}
+                    onClose={() => dispatch({ type: MOVE_ERROR, payload: null })}
+                />
+                <View style={styles.row}>
+                    <Text style={styles.label}>Name: </Text>
+                    <TextInput
+                        value={move.name}
+                        onChangeText={(text) => setMove({ ...move, name: text })}
+                        style={styles.input}
+                    />
+                </View>
+                <View style={styles.row}>
+                    <Text style={styles.label}>Category: </Text>
+                    <Picker
+                        selectedValue={move.category}
+                        style={styles.input}
+                        onValueChange={(itemValue: ItemValue) =>
+                            setMove({ ...move, category: itemValue as MoveCategoryName })
+                        }>
+                        {Object.values(MoveCategoryName).map((value) =>
+                            <Picker.Item key={value} label={value} value={value}/>
+                        )}
+                    </Picker>
+                </View>
+                <View style={styles.row}>
+                    <Text style={styles.label}>Power: </Text>
+                    <TextInput
+                        value={move.power.toString()}
+                        onChangeText={(text) => {
+                            if (!isNaN(Number(text))) {
+                                setMove({ ...move, power: Number(text) });
+                            }
+                        }}
+                        style={styles.input}
+                        keyboardType="numeric"
+                    />
+                </View>
+                <View style={styles.row}>
+                    <Text style={styles.label}>Accuracy: </Text>
+                    <TextInput
+                        value={move.accuracy.toString()}
+                        onChangeText={(text) => {
+                            if (!isNaN(Number(text))) {
+                                setMove({ ...move, accuracy: Number(text) });
+                            }
+                        }}
+                        style={styles.input}
+                        keyboardType="numeric"
+                    />
+                </View>
+                <View style={styles.row}>
+                    <Text style={styles.label}>Type: </Text>
+                    <Picker
+                        selectedValue={move.type.name}
+                        style={styles.input}
+                        onValueChange={(itemValue: ItemValue) =>
+                            setMove({ ...move, type: { ...move.type, name: itemValue as TypeName } })
+                        }>
+                        {Object.values(TypeName).map((value) =>
+                            <Picker.Item key={value} label={value} value={value}/>
+                        )}
+                    </Picker>
+                </View>
+                <Text>Weak Against: {selectedWeakAgainst.join(', ')}</Text>
+                <View style={styles.buttonContainer}>
+                    <Button title="Select Weak Against" onPress={() => handleOpenModal('weakAgainst')}/>
+                </View>
+                <Text>Effective Against: {selectedEffectiveAgainst.join(', ')}</Text>
+                <View style={styles.buttonContainer}>
+                    <Button title="Select Effective Against" onPress={() => handleOpenModal('effectiveAgainst')}/>
+                </View>
+                <View style={styles.buttonContainer}>
+                    <Button title="Save" onPress={handleSave} color={styles.saveButton.backgroundColor}/>
+                </View>
+            </ScrollView>
+            <Modal
+                animationType="slide"
+                transparent={true}
+                visible={isModalVisible}
+                onRequestClose={() => {
+                    setModalVisible(!isModalVisible);
+                }}>
+                <View style={styles.centeredView}>
+                    <View style={styles.modalView}>
+                        <MultiSelect
+                            items={
+                                Object.values(TypeName).map((value) => ({ id: value, name: value }))
+                            }
+                            uniqueKey="id"
+                            onSelectedItemsChange={
+                                (selectedItems) => handleSelectType(selectedItems, currentMultiSelect === 'weakAgainst' ? setSelectedWeakAgainst : setSelectedEffectiveAgainst, currentMultiSelect === 'weakAgainst' ? selectedEffectiveAgainst : selectedWeakAgainst)
+                            }
+                            selectedItems={currentMultiSelect === 'weakAgainst' ? selectedWeakAgainst : selectedEffectiveAgainst}
+                            displayKey="name"
+                        />
+                        <Button title="Close" onPress={() => setModalVisible(false)}/>
+                    </View>
+                </View>
+            </Modal>
+        </KeyboardAvoidingView>
     );
 };
 
@@ -167,14 +208,49 @@ const styles = StyleSheet.create({
         flex: 1,
         padding: 16,
     },
+    label: {
+        marginRight: 8,
+    },
     input: {
         backgroundColor: '#CEC',
         borderRadius: 8,
-        height: 32,
+        minHeight: 32,
+        flex: 1,
     },
-    label: {
+    row: {
+        flexDirection: 'row',
+        alignItems: 'center',
+        justifyContent: 'flex-start',
         margin: 8,
-    }
+        flexWrap: 'wrap',
+    },
+    centeredView: {
+        flex: 1,
+        justifyContent: "center",
+        alignItems: "center",
+        marginTop: 22
+    },
+    modalView: {
+        margin: 20,
+        backgroundColor: "white",
+        borderRadius: 20,
+        padding: 35,
+        alignItems: "center",
+        shadowColor: "#000",
+        shadowOffset: {
+            width: 0,
+            height: 2
+        },
+        shadowOpacity: 0.25,
+        shadowRadius: 4,
+        elevation: 5
+    },
+    buttonContainer: {
+        margin: 8,
+    },
+    saveButton: {
+        backgroundColor: '#BADA55',
+    },
 });
 
 export default MoveFormScreen;