As long as Gliscor is your Active Pokémon, your opponent can't remove any Special Conditions by evolving or devolving his or her Pokémon. (This also includes putting a Pokémon Level-Up card onto the Pokémon.)
Flip a coin. If heads, put damage counters on the Defending Pokémon until it is 10HP away from being Knocked Out. If you do, shuffle Gliscor and all cards attached to it into your deck.
The Defending Pokémon is now Burned.