What if Pokemon had their 2 abilities combined? Only use mons with 2 standard abilities, hidden not allowed

e.g. Krookodile = Intimidate + Moxie
Porygon-Z = Adaptability + Download
Bronzong = Levitate + Heatproof
Excadrill = Sand Rush + Sand Force

What would their tiers be? How badly will it fuck up the meta?