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>Psychic
Psychic types are now immune to mental effects, which includes effects such as infatuation, taunt, encore, disable etc.
This identical to the mental herb effects and gives Psychic types a niche of being hard to disrupt compared to other pokemon. Keep in mind that flinch moves such as fake out and sleep moves such as spore still affect psychic types, so they are not impossible to interact with.
>Bug types
Fairy no longer resist Bug. Bug is now super effective against Fairy. Ghost types no longer resist bug. Bug types now resists Fairy. Bug now resists Dark.
One of the main weaknesses of Bug is that Bug type is an actively detrimental typing both offensively and defensively. These changes are made to address that.
>Rock Type
Rock slide is now 100% accurate. Rock Tomb is now 100%.
We all know this one needs to happen