What's the most powerful monotype team with which you can

Normal

>>33057692
Snorlax, Blissey and ?

>>33057699
Snorlax, Miltank and Smeargle?

>>33057712
Snorlax as a mixed tank with belly drum, earthquake, and either two elemental punches or Return plus Rest.

Miltank as a fast physical tank with milk drink for recovery, maybe use Reversal (an egg move) if you feel confident.

Blissey as a special wall with Soft-boiled recovery.

>>33057683
fairy

>>33057683
Just use Snorlax

You don't really need more

>>33057683
Rock or Flying

>>33057683
Psychic (Mewtwo, Mew, Lugia).

If you can't trade from Gen 1, Flying (Lugia, Ho-Oh, filler). Something like Skarmory or Dragonite should work well in that last spot.