The big drumset literally ruins Rillaboom as a starter choice. It's dumb, unnessecary and pretty detrimental considering that it's a physical(high attack stat) gorrilla that needs to move around and fight up close in battle. How is it even going to fight and win with a drumset? That's why you almost never see it in it's official artwork and why Rilaboom is the least popular starter choice in Galar.