Charles, having barely endured the assault, complies with Fletcher's command and vanishes away with a little red dash effect. Emrys hits the onix with another bead of flame to get its attention. Before it can retaliate, Roland charges in, jumps on its back and wraps his arms around its rocky midsection.

As if by reflex, the onix flops over and wraps around Roland in turn. Roland can feel the monster's strange glassy coating as it presses in on him... (The Onix also knows bind. Roland loses a tick of hit points.)

...but his plan already accounted for that. Excidium gets another clear opening and overwhelms the onix with another bubble! The coating, its glowing eyes, and the stone segments that make up its body all seem to shatter apart at once as the boss disintegrates into dust and shards and shadows.

Likewise, the rock traps in the ground fizzle away in a puff of smoke, including the last one by the stairs. On that side of the room, the igglybuff is starting to get worn out by Zero's increasingly squeaky antics. It it rubs the latest scratch on its little cheek, huffs indignantly, and hops up one step as it clears its throat. (-1 more combat stage, and it looks like it's going to try a more serious performance.)

Spoiler: Battle Stuff
Show
Location - Mt. Moon Tokens
Tower - Crystal Stairs Igglybuff, Zero, Pokéball
Tower - Foyer Monty, Roland, Excidium
Tower - Entrance Fletcher, Emrys, Finn

Speed Order:

Onix: DEFEATED!
Monty: 15
Fletcher: 13
Zero: 12
Charles: 12
Finn: 10
Roland: 10
Emrys: 10-1
Excidium: 9
Little Guy: 1 (CAUGHT!)
Igglybuff: 1 (Telegraphing Sing)