There are probably more differences from vanilla mechanics that I haven’t realized. Please tell me if you find one.
Safeguard
Safeguard has very specific situations in vanilla. In YAPU, it is very straight forward: It will protect you from statuses, drowsiness and confusion as long as they were to be inflicted by an oponent.
Substitute
Vanilla Substitute is a mess of exceptions and special cases. It is more standarized in YAPU:
- Any move that will deal damage deals it to the substitute (except those that specifically bypass it).
- Any damage by other means (weather, status, etc) is done to the Pokémon.
- Pokémon with substitutes cannot be inflicted a status or volatile status by an opponent.
- Life draining effects won’t cure when using Substitute.
That’s it, no weird exceptions. Check Substitute for all Substitute mechanics.
Ghost-Type Curse
Like in Gen VIII and on, Ghost-Type Curse chooses a random target among the enemies. Unlike in vanilla, in a double battle, in case no opponent is present, Curse will not fail, but no target will be cursed.
Fixation Moves
Moves like Outrage or Petal Dance will not confuse the user if the move fails on the last turn the move would have been performed. It will only confuse if the move has been successfully performed on all turns.
Rock Smash
Rock Smash’s power has been raised to 65 so it is usable.
Cut
Cut’s power has been raised to 70 so it is usable.
Dragon Tail
Dragon tail will force to switch even if the user faints due to effects like Rocky Helmet or Rough Skin.
When used against single wilds with equal or lower level, Dragon Tail will allow the player to run away, resulting in the same effect as in vanilla but different animation.
Fling
If a Pokémon uses Protect or a similar move against Fling, the item will not be consumed.
Focus Punch
Instead of the charging mechanic, Focus Punch is just a priority -3 move that will fail if the user has been hit this turn. It will consume PP even if it fails.
Acrobatics
Acrobatics power is calculated before a Flying Gem would be consumed, so it won’t double the power, unlike in vanilla.
Roost, Burn Up, Forest’s Curse and Trick-or-Treat
If a Pokémon is affect by both Roost and Burn Up in vanilla, it will become typeless. It becomes a Normal type in YAPU, as with single typed Pokémon.
If a Pokémon is affected by Forest’s Curse or Trick-or-Treat and by Roost or Burn Up, the typing will depend on the timestamps of the moves. If Roost or Burn Up have been used before Forest’s Curse or Trick-or-Treat, the Pokémon will be Normal + Grass or Ghost type. If Roost or Burn Up have been used second, the Pokémon will only be of the Grass or Ghost type.
Pursuit
Pursuit deals triple the damage when the target is switching out but has a default -1 priority.
Snatch
If Swallow is stolen and the user of Snatch is not under the effects of Stockpile, it will do nothing.
When Snatch steals Rest or Swallow, the effect will depend on the user of Snatch.
Metronome
Snarl can be called by Metronome.
Charge
Charge’s effect does stack with Electromorphosis or Wind Power, unlike in vanilla.
Present
Present does not consume gems or similar items when healing.
Pay Day
Money earned is based on the level of the user at the time of using the move.
Weather moves
The following moves can be used out of battle to change the weather:
| Move | Weather |
|---|---|
| Defog | Clears any weather |
| Mist | Fog |
| Sandstorm | Sandstorm |
| Hail | Snow |
| Rain Dance | Rain |
| Sunny Day | Sunny |
Low Kick
Low Kick uses the weight of the specific individual instead of the base of the species.
Gravity
Gravity does not prevent using moves like Fly, but they will fail.
Aurora Veil
Aurora Veil does stack with Reflect and Light Screen.
Rage Fist
Rage fist has to hit in order to count towards evolving Primeape.
Trick Room
Trick Room correctly inverts the order regardless of the 1809 speed cap in vanilla.
Transform
Transform doesn’t copy IVs and EVs but it will still replace all the calculated base stats of the copied monster.
Stuff Cheeks
Stuff Cheeks can be used even if the user isn’t holding a berry, but it will fail.