TM21 is an item in the “All machines” category (TMs and HMs). It costs ₽1000.
In-game descriptions
| Ruby / Sapphire · Emerald | The less the user likes you, the more powerful this move. |
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| FireRed / LeafGreen | This attack move grows more powerful the less the user likes its TRAINER. |
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| Diamond / Pearl · Platinum · HeartGold / SoulSilver · Black / White · Black 2 / White 2 · X / Y | A full-power attack that grows more powerful the less the user likes its Trainer. |
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| Sun / Moon · Ultra Sun / Ultra Moon | This full-power attack grows more powerful the less the user likes its Trainer. |
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| Let’s Go, Pikachu! / Let’s Go, Eevee! | The user turns the target’s power against it. The higher the target’s Attack stat, the greater the damage it deals. |
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| Sword / Shield | The user goes to sleep for two turns. This fully restores the user’s HP and heals any status conditions. |
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Move taught
| Red / Green · Blue · Red / Blue · Yellow | Mega Drain |
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| Gold / Silver · Crystal · Ruby / Sapphire · Emerald · Colosseum · XD · FireRed / LeafGreen · Diamond / Pearl · Platinum · HeartGold / SoulSilver · Black / White · Black 2 / White 2 · X / Y · Omega Ruby / Alpha Sapphire · Sun / Moon · Ultra Sun / Ultra Moon | Frustration |
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| Let’s Go, Pikachu! / Let’s Go, Eevee! | Foul Play |
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| Sword / Shield | Rest |
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| Brilliant Diamond / Shining Pearl | Dazzling Gleam |
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| Scarlet / Violet | Pounce |
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| Legends: Z-A | Thunder Fang |
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Where to find it
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h