Pokémon Mystery Dungeon: Explorers of Time Tips

Blizzard Island - Post Ending
To get Blizzard Island you must first graduate from the guild, beat Mystifying Forest, then do a job, and go to sleep (at least twice). Then, talk to Mr. Mime (near the Kecleon Market).
Poke'mon at Blizzard Island:
Golduck, Marill, Azumarill, Sneasal, Piloswine, Delibird, Smoochum, Vigoroth, Azurill, Nosepass, Swablu, Snowrunt, Piplup, and Castform.
There is mostly water and poke'mon here of low levels, bring a trusty fire type to knockem' out easily.

Once you reach the 20th floor of Blizzard Island you'll go strait to Crevice Cave.
Crevice Cave-
Golduck, Jynx, Marill, Azumarill, Sneasal, Swinub, Piloswine, Delibird, Smoochum, Slakoth, Vigoroth, Slaking, Azurill, Nosepass, Swablu, Alataria, Zangoose, Snowrunt, Piplup, Prinplup, Empoleon, Snover, Weavile, Glaceon, and Mamoswine.

Froslass, an ice and ghost poke'mon, lv. 41, ability: Snow Coat.
Note- watch out, Normal attacks only due half of the damage they would usualy do!