For me I don't have a specific one as many can fit this role, but my spiker, stealth rock user would be my MVP. I always use an entry hazard setter in every battle I do because it honestly is needed. Chipping away at your opponent's health by forcing switches and damaging most Pokemon at entry is very important and helpful in winning a battle. That is why I consider my MVP my hazard setter. Some I use frequently are: Skarm, Ferro, Nidoqueen, Hippo, and a few more.