Will there be seasons or a season pass for Pokemon Unite?
Yes. The game lists the current season as Season 1, and there is a Battle Pass that can be purchased for it. The Battle Pass works similarly to League of Legends, where competing in battles each season grants you extra rewards so long as you have the Battle Pass. Battle Passes can be purchased using the game's Gem currency. So far, we can't find where to buy Gems with real money, but they can be collected by leveling up your trainer.