Chuck assisted with the evacuation of the Pokémon, Bud carrying some of the smaller Pokémon on his back, and Megumin blasting holes in the wall where it was safe to do so to ensure a quick escape before the bombs went off.  When asked about the egg, Chuck said "I'll get it and hold on to it for now."  He told Bud and Megumin to go with Liam and help the others escape, and had Azriel direct him to the egg.