In-setting, shifters are either humans or pokemon that can change into either a pokemon or human. So say, for example, you have a mermaid character. You could have that character be human shifter (a human that can shift into a pokemon, so, for example, goldeen), or a pokemon shifter (a pokemon that can shift into a human, so, for example, a goldeen that can take human form). Their abilities are framed into that pokemon's particular moveset.
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In-setting, shifters are either humans or pokemon that can change into either a pokemon or human. So say, for example, you have a mermaid character. You could have that character be human shifter (a human that can shift into a pokemon, so, for example, goldeen), or a pokemon shifter (a pokemon that can shift into a human, so, for example, a goldeen that can take human form). Their abilities are framed into that pokemon's particular moveset.