diff --git a/test/dynamax.c b/test/dynamax.c
new file mode 100644
index 0000000000..ca05b4bd08
--- /dev/null
+++ b/test/dynamax.c
@@ -0,0 +1,136 @@
+#include "global.h"
+#include "test_battle.h"
+
+// DYNAMAX FEATURES
+/*
+SINGLE_BATTLE_TEST("(DYNAMAX) Dynamax increases HP and max HP by 1.5x")
+{
+    GIVEN { // TODO: Dynamax level
+        PLAYER(SPECIES_WOBBUFFET) { MaxHP(100); HP(80); }
+        OPPONENT(SPECIES_WOBBUFFET)
+    } WHEN {
+        TURN { MOVE(player, MOVE_TACKLE, dynamax: TRUE); MOVE(opponent, MOVE_CELEBRATE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_DYNAMAX_GROWTH, player);
+        MESSAGE("Wobbuffet used Max Strike!");
+        MESSAGE("Foe Wobbuffet used Celebrate!");
+    }
+}
+*/
+/*
+SINGLE_BATTLE_TEST("(DYNAMAX) Dynamax expires after three turns.")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET) { MaxHP(100); HP(80); }
+        OPPONENT(SPECIES_WOBBUFFET)
+    } WHEN {
+        TURN { MOVE(player, MOVE_TACKLE, dynamax: TRUE); } // 1st max move
+        TURN { MOVE(player, MOVE_TACKLE); } // 2nd max move
+        TURN { MOVE(player, MOVE_TACKLE); } // 3rd max move
+    } SCENE {
+        int i;
+        for (i = 0; i < DYNAMAX_TURNS; ++i) {
+            MESSAGE("Wobbuffet used Max Strike!");
+            MESSAGE("Foe Wobbuffet used Celebrate!");
+        }
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_FORM_CHANGE, player);
+    } FINALLY {
+        EXPECT_EQ(player->hp, 80)
+        EXPECT_EQ(player->maxHP, 100)
+    }
+}
+*/
+
+// MAX MOVE EFFECTS
+SINGLE_BATTLE_TEST("(DYNAMAX) Max Strike lowers single opponent's speed")
+{
+    GIVEN {
+        // Fails?: ASSUME(GetMaxMove(B_POSITION_PLAYER_LEFT, MOVE_TACKLE) == MOVE_MAX_STRIKE);
+        ASSUME(gBattleMoves[MOVE_MAX_STRIKE].argument == MAX_EFFECT_LOWER_SPEED);
+        OPPONENT(SPECIES_WOBBUFFET) { Speed(100); }
+        PLAYER(SPECIES_WOBBUFFET) { Speed(80); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_TACKLE); MOVE(player, MOVE_TACKLE, dynamax: TRUE); }
+        TURN { MOVE(player, MOVE_TACKLE); MOVE(opponent, MOVE_TACKLE); }
+    } SCENE {
+        // turn 1
+        MESSAGE("Foe Wobbuffet used Tackle!");
+        MESSAGE("Wobbuffet used Max Strike!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        // turn 2
+        MESSAGE("Wobbuffet used Max Strike!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TACKLE, opponent);
+    }
+}
+
+DOUBLE_BATTLE_TEST("(DYNAMAX) Max Strike lowers both opponents' speed")
+{
+    GIVEN {
+        // Fails? ASSUME(GetMaxMove(B_POSITION_PLAYER_LEFT, MOVE_TACKLE) == MOVE_MAX_STRIKE);
+        ASSUME(gBattleMoves[MOVE_MAX_STRIKE].argument == MAX_EFFECT_LOWER_SPEED);
+        PLAYER(SPECIES_WOBBUFFET) { Speed(80); }
+        PLAYER(SPECIES_WOBBUFFET) { Speed(79); }
+        OPPONENT(SPECIES_WOBBUFFET) {Speed(100); }
+        OPPONENT(SPECIES_WOBBUFFET) { Speed(99); }
+    } WHEN {
+        TURN { MOVE(playerLeft, MOVE_TACKLE, target: opponentLeft, dynamax: TRUE); \
+               MOVE(opponentLeft, MOVE_TACKLE, target: playerLeft); \
+               MOVE(opponentRight, MOVE_TACKLE, target: playerLeft); }
+        TURN { MOVE(playerLeft, MOVE_TACKLE, target: opponentLeft); \
+               MOVE(opponentLeft, MOVE_TACKLE, target: playerLeft); \
+               MOVE(opponentRight, MOVE_TACKLE, target: playerLeft); }
+    } SCENE {
+        // turn 1
+        MESSAGE("Foe Wobbuffet used Tackle!");
+        MESSAGE("Foe Wobbuffet used Tackle!");
+        MESSAGE("Wobbuffet used Max Strike!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponentLeft);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponentRight);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        // turn 2
+        MESSAGE("Wobbuffet used Max Strike!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponentLeft);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponentRight);
+        MESSAGE("Foe Wobbuffet's speed fell!");
+        MESSAGE("Foe Wobbuffet used Tackle!");
+        MESSAGE("Foe Wobbuffet used Tackle!");
+    }
+}
+
+SINGLE_BATTLE_TEST("(DYNAMAX) Max Flare sets up sunlight.")
+{
+    GIVEN {
+        ASSUME(gBattleMoves[MOVE_MAX_FLARE].argument == MAX_EFFECT_SUN);
+        OPPONENT(SPECIES_WOBBUFFET);
+        PLAYER(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, MOVE_EMBER, dynamax: TRUE); MOVE(opponent, MOVE_CELEBRATE); }
+    } SCENE {
+        MESSAGE("Wobbuffet used Max Flare!");
+        MESSAGE("The sunlight got bright!");
+        MESSAGE("Foe Wobbuffet used Celebrate!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_SUN_CONTINUES);
+    }
+}
+
+SINGLE_BATTLE_TEST("(DYNAMAX) Max Overgrowth sets up Grassy Terrain.")
+{
+    KNOWN_FAILING
+    GIVEN {
+        ASSUME(gBattleMoves[MOVE_MAX_OVERGROWTH].argument == MAX_EFFECT_GRASSY_TERRAIN);
+        OPPONENT(SPECIES_WOBBUFFET) { MaxHP(256); HP(128); }
+        PLAYER(SPECIES_WOBBUFFET) { MaxHP(256); HP(128); }
+    } WHEN {
+        TURN { MOVE(player, MOVE_VINE_WHIP, dynamax: TRUE); MOVE(opponent, MOVE_CELEBRATE); }
+        TURN {}
+    } SCENE {
+        MESSAGE("Wobbuffet used Max Overgrowth!");
+        MESSAGE("Foe Wobbuffet used Celebrate!");
+        //HP_BAR(player, damage: -player->maxHP / 16);
+    }
+}
diff --git a/test/test_battle.h b/test/test_battle.h
index 16918251b1..5e2306a7a5 100644
--- a/test/test_battle.h
+++ b/test/test_battle.h
@@ -722,6 +722,7 @@ struct MoveContext
     u16 megaEvolve:1;
     u16 explicitMegaEvolve:1;
     // TODO: u8 zMove:1;
+    u16 dynamax:1;
     u16 allowed:1;
     u16 explicitAllowed:1;
     struct BattlePokemon *target;
diff --git a/test/test_runner_battle.c b/test/test_runner_battle.c
index ec7ba275c2..8043aba51c 100644
--- a/test/test_runner_battle.c
+++ b/test/test_runner_battle.c
@@ -1217,6 +1217,9 @@ void Move(u32 sourceLine, struct BattlePokemon *battler, struct MoveContext ctx)
 
     if (ctx.explicitMegaEvolve && ctx.megaEvolve)
         moveSlot |= RET_MEGA_EVOLUTION;
+    
+    if (ctx.dynamax)
+        moveSlot |= RET_DYNAMAX;
 
     if (ctx.explicitTarget)
     {