In this deck, there are many switching items suchas Jet Energy, Rescue Board, Switch etc. so you can frequently attack with Palafin who needs to have switched in to use Justice Kick. When looking for partners for Palafin, i saw Feraligatr and thought of how many decks built around it try to switch between 2 Feraligatrs to get around not being able to attack. This made me realise that it would be a great partner for Palafin since they both want to keep switching to optimize their low-energy and high-damage attacks.