1st edition pokemon cards with shadow Is shadowless unlimited? - General Pokémon Power Machamp - 8/102 - Pokemon

The main strength of this is that it is white and nothing else thus giving you a bit more build options with heavy white bases

Crawling Chorus is special because it can replace itself, meaning youre less likely to get blown out by a board wipe

You can use this to go all in with your Active Pokemon or split the Energy by giving the standard Energy of the turn to your Benched Pokemon and the one produced by this Ability to your Active

I'm not sure if it's really considered a combo, but my favorite interaction is Repercussion and Blasphemous Act

She also has great synergy in a deck with a lot of milling your foes as they are increasingly likely to be faced with the dreaded question of 10 life or casting the spell in their hand