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In PMD1 I never found Monster House to be much of a threat because all the wild pokemon do like 1 damage to me with their normal attacks.
In PMD2 I use a roomwide move not named Vacuum Cut (18 damage sucks) if possible, or just use a room-wide orb. I carry a bunch of Foe-seal orb on most...
Porygon2 is a better user of Trace than Gardevoir for the most part (if you're actively using Trace to counter stuff), because it can use it to counter DDSalamence and pretty much every Gyarados out there, whereas Gardevoir (even after tracing an Intimidate) can't stay in comfortably against...