Does anyone have documentation about the affection/friendship based battle mechanics?

[Lunos]

Hi. I'm seeing a thread with a question of similar nature involving asking for information about how a certain mechanic works in this same section of the forum, so I hope I'm not breaking any rules by posting this here.

Does anyone have reliable or trustworthy documentation about the battle mechanics that can be triggered if the Player's Pokémon has high affection or friendship?

The closest thing I've been able to find is Bulbapedia's article on the matter, but it's not exactly complete. For example, it doesn't mention what's the chance that a Pokémon has to avoid a move in battle.

Thanks in advance for reading!