exilon

Hey, I'm up to Demon Galvantula and I'm inside the Dimensional Rift. The game was going well so far but Demon Galvantula just seems impossible to beat :/ He constantly uses Electroweb and it hits every 'mon twice. None of my team resists it and my partner's pokemon basically all get OHko'd from it. I can't seem to leave the rift by whatever means or even level up inside, so I'm basically stuck repeating this process? Is there something I can do?