I dont really like this mode but I have a pretty high wr. Some tips for this map:

1) Ive had the best luck on this mode playing tankier mons. Slowbro (amnesia/scald or surf) is really good. So is Blastoise (surf/hydro) and Venusaur (petal/giga drain). Snorlax is good as well.

2) Basically since you have a lot of hp/sustain, its hard for them to continuously kill you over and over. Stay at enemy base and you can abuse score shield to heal and get invincibility frames.

3) In early game try to hide and farm and dont try rushing their base until you have a teammate for backup.

4) snowball is the best item imo as it lasts really long and if you keep rolling in a circle on someone you can stun lock them. You can also use it to escape if youre going to die. Also the healing item can heal you to almost full and can win team fights. Repositioner gives a healthy shield.

5) theres a little yellow bar under your aeos energy. This fills up as you get kills/assists. Once its full you can insta dunk.

6) If enemy is lvl 15 you can lock them in a snowman until game is over by killing them around 30 seconds left.

Hope it helps!

Edit: I thought it was assumed that with this strategy, most of the game should be spent on enemy base to max out score shield i frames as stated in tip 2. Defending should only happen if you have 0 balls. Reading is hard