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1. Get a team of Ghost pokemon (preferably Golurk/Golett) and give them the move Megahorn and if you have the coins, buy the Move TM06 (a.ka. Toxic), another move is useful is Fly, but You will need to beat the Legendaries ZapMoltcuno from NPC Fight.

if you have the moves, first use toxic, then use neither Fly or Megahorn until you defeats Mew.

2. at the moment The Old House it unusable, since it only for around Halloween time, so if even if you get the password, there nothing you can do in there.