I can defeat most 5 star Tera raids solo, but I use either online randoms or Discord to coordinate a team for 6 star Tera raids. When my teammates are actually helpful, a 6 star Tera raid can be completed in under 5 minutes. It helps to have 1-2 attackers and the remaining Pokémon providing buffs/debuffs/heals/support. However, not everyone likes to play support. It's a boring yet necessary role. Someone should be using Screech, Fake Tears, Acid Spray, screens etc. I play either offensive or support roles.