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>Make seasons change once every week
>If not that, introduce a mechanic or facility revolving around Castform as the mascot that forcibly changes the Season to whatever you desire in the region that you can only use once per day or week
>Have the seasons actually heavily alter the weather and environment around the region instead of being simple grass changes
>About 5 or 6 specific lines of Pokemon only show up in a particular season
Best way to approach it honestly.