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Remove per move PP and make it a pool per pokemon per battle. Moves now cost 1-8 PP, Each mon has 8 PP pool, restores 2 each turn.
Instead of choosing a move, you can now dodge, block, and throw partners (in non single battles).
Moves never miss unless the opponent dodges.
Blocking reduces received damage.
All types now have statuses associated with them. Each type gets a buff and debuff status effect.
IVs are removed.
Flying is now Wind type.
Pokemon that can fly, float, glide or levitate are in a state of being in the air unless they are grounded. Being in the air makes a mon weak to electric type attacks.
Electric is neutral against Wind types that are not in the air.
Pokemon can have any type as a mutation, and this is 1000x rarer than shinies.
Mutated pokemon have pallete swaps according to their type e.g. fire type pikachu is red/orange.
You can upgrade a pokemon's BST a certain number of times, more if they are initially weak e.g. Caterpie, less or not at all if they are initially strong e.g. Mewtwo.