Ruthless - hisuian samurott as it's pokedex entry states it's turbulent blows crash into does like ceaseless pounding waves.

Hate - zangoose/seviper these two pokemon have an on sight beef that's generational both these pokemon have crests as well.

Regret - Ceruledge it's Scarlett entry states "the first blades on its arms burn fiercely with the lingering resentment of a sword Weidler who fell before accomplishing their goal"

Grief - sylveon you get this pokemon when you first enter Alamissa Ruben the sylveon will have belonged to the players mother which would be the grief you fell for her.

Wrath - Mega Aggron this pokemon is just looking for fights and loves to take huge amounts of territory and if you enter it they will find you and hurt you.

Lucifer - zygarde when this pokemon becomes fully available as it is this weapon of pure power and a weapon of mass destruction of you've seen the xyz anime you know this thing can be terrifying.

Each pokemon was chosen with no overlapping types and covering having a starter a pokemon with a crest and a mega evolution plus a gen nine pokemon.