Mixi-Max (linking a Galaxy character with a Chrono Stone character) is the true endgame.
The game forces you to make hard choices. The "Best Players" aren't just the ones with the highest numbers; they are the ones with the best Kizuna (Bonds). A team of individually high-stat players will fail against the final bosses if their links aren't strong. This creates a beautiful meta where the "Best Team" is subjective to your playstyle. inazuma eleven go galaxy best players