What are the differences for playing JJ by yourself vs on a team?

When you are on a good team, you can get large amounts of energy to play by sharing cafe drinks at meeting time. That's how players accumulate tens of thousands of energy. Some teams also exchange bushes, which give you more game resources. Only on a team can you play the competitions (Time Rush and Spot the Difference) and compete with other teams in the Detective League, which provide weekly and end-of-league prizes to aid in gameplay. None of these are necessary for playng JJ, but they will help when you get futher along in the game.