Basically, take your two favorite Pokemon and combine their base stats, typings, movepool, and both hidden abilities then tell me how broken is this monster.

For me, I like delphox and kommo-o, what they become is a fire-fighting-psychic-dragon (good god, this already sounds like a deviant art oc).

Making it neutral against: Normal, ice, poison, dark, psychic, rock, and water
Weak against: dragon, fairy, flying, ground, and ghost (x4)
Resistant to: bug, steel, electric, fighting, grass (1/4), and fire (1/4).

HP: 150
Attack: 179
Defense: 197
Sp. Attack: 214
Sp. Defense: 205
Speed: 189

Abilities together are overcast and magician...

And it seems these two together would still eat shit from two combined yungoos.

Or anything with shadowball.