Magma Mountain

Magma mountain has many useful digimon guilmon(who can be reverted to sunmon) Most of the Olympos XII set is there. To unlock this, beat flame war title match. This is very useful for completing the digimon challenges which include:

Chess: collect enough chessmon and digivolved forms to play chess! Gods: Get all digimon with roman names which is dianamon Apollomon merukimon minervamon neptunmon venusmon vulcanusmon ceresmon and marsmon

Doppelgängers: collect doppelgängers such as BRapidmon and Rapidmon, terriermon and lopmon, gummymon kokomon pawnchessmonw pawnchessmonB and ton others.

Master Tamer: Beat the championships and collect every title metal

Super Collector: fill digipedia completely

Eternity Partners: have a digimon revert to egg 1000 times