Add Gen IV Great Marsh changing encounters#1499

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Machine-Maker wants to merge 2 commits intoPokeAPI:masterfrom

Machine-Maker:feature/gen-iv-great-marsh

Commits on Apr 19, 2026

Add Gen IV Great Marsh changing encounters
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Commits on Apr 25, 2026

Merge branch 'master' into feature/gen-iv-great-marsh
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