PokéBase - Pokémon Q&A
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They change in:

  • Stats
  • Movepool
  • Level Up moves
  • Ability (sometimes)
  • Gender (Only in the Marill evolutionary line)
  • Typing (sometimes)
  • Appearance
Not always most of the time yes for example porygon has trace and when it evolves it also has trace.
But the magikarp has swift swim but gyarados has intimidate.
Id say about 25% of pokemons abilitys change when they evolve.

Beat me to it mew