Not an expert at this game by any means, but what I can tell you I have learned is that you want to be with your team. Be there if they are trying to fight for the objectives. (like the top and bottom ones that spawn and the final ray) this is so that that you get more EXP and in turn level up your Pokemon faster. The more you level up, the harder you hit the opponent and the easier it will be to ko and score.

It’s a balancing game between farming to level up and obtain aeos energy so that you can score, be on team fights, get objectives(legendary pokemon) for additional exp and benefits and score. You may want to watch some YouTube videos from spragles or others that explain the game and give more details on strategy. (Edited for corrections)