>>58033149It's a very strong non-EX Normal type Stage 1 (so can be splashed in decks of any type) that ramps perfectly if going second (Basic has a 1 energy attack that deals 20 damage + 20 if you flip heads, stage 1 has a 2 energy attack that deals 50 + 50 if you played a Supporter that turn, something you'll be doing most every turn, so that's a potential 140 damage in 2 turns, more if the Supporter you've played is Giovanni or Red).
It also has a dedicated fishing Supporter in Gladion that draws a random Type:Null or Silvally from your deck, making evolving it into doing 100 damage even easier.
The two core decks with it are pairing it with Rampardos, a very powerful, low-energy cost fossil stage 2, making Type:Null the only Basic in your deck, guaranteeing you finding it for your oppener, and pairing it with Zeraora and Oricorio, Zeraora being able to generate lightning energy at the end of your first turn, meaning you might be able to immediately evolve into Silvally and attack for 100 even if going first with the Supporter Dawn that moves an energy from your bench to your active Pokémon.