You've probably seen the millions of rom hacks with their own type changes to Pokémon, giving them their own niche in the hack while also buffing the Pokémon. Elite Redux does do type changes, and they're are quite a ton of changes. The following Pokémon have had their types changed from vanilla Pokémon Emerald and up.
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Fire / Flying | ---- > | Fire / Dragon |
|---|---|---|---|