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Platypus and Echidna as version exclusives. They have 3 Types each. Platypus is Water/Poison (aquatic species, males have poisonous spurs). Echidnas are Ground/Steel (burrowing creatures, spines/quills are metal because why not).
They have Electrosensation as their ability, based off how they're the only mammals to have Electroreception and as a signature of the 'monotreme duo'. This provides their third type, Electric and reduces the effectiveness of all enemy damage multipliers by 25% (like Solid Rock except it applies separately to SE, critical hits, STAB, etc).
