Oceana piere trade, trade normal Rockruff for a special one, and just evolve it.
We got some cool new pokemons in v12:
Axew and aron for 20k and 5k coins in scholar discrtict
Gible and Skarmory in zone zero
Pawniard and gooey, aviable after gooey quest
Popplio from one of the sisters who gives you dark shard after defeating them, aquamarine cave + dive needed
Rotom in lost castle after finishing Narcissia quest, you can change forms in west garena power plant.
And deino, department of dreams 7th floor, show gible to a woman, and go to a shrine north from Kristilne Town.
Bagon is not avaiable in the game, only with the mods.
The dragons: Jangmo-o (no longer avaiable), altaria, alola exeggutor, flygon, drampa, turtonator, Dragalge, noivern, tyrunt(not sure if the fossil is form the mods, or in the game by itself) and i think axew from mystry egg (not sure about this one)
How about a crest, that is also reducing stats?
Just example:
Crobat crest: -30atk. +50s.atk
Just pick a pokemon who can benefit from a change like this.
7/8 badges. Its available after Kyogre fight.
Ita also available as a starter in v9, as jackpot starter with few others, like Axew, eevee and Jangmo-o (maybe more, idk)