If they are real, here are my stat layouts.

Koffing -> Weezing
Type: Poison/Rock
Ability: Levitate
HA: Levitate
Base Stats:
40/65/95/60/45/35 -> 65/90/120/85/70/60
Moveset: Clear Smog, Power Gem, Rock Slide, Sludge Bomb, Head Smash

Gulpin -> Swalot
Type: Poison/Fighting
Ability: Guts/Thick Fat
HA: Anger Point
Base Stats:
70/53/63/43/53/20 -> 100/83/93/73/83/35
Moveset: Sludge Bomb, Superpower, Focus Energy, Acupressure, Close Combat Power-up Punch

Trubbish -> Garbodor
Type: Poison/Steel
Ability: Sturdy
HA: Filter
Base Stats:
50/50/77/30/77/55 -> 80/95/97/50/97/65
Moveset: Gunk Shot, Bullet Punch, Poison Jab, Iron Defense, Iron Head