I actually did manage to beat this one with the difficulty nerf solo wise in 2 attempts. As the squishiest player in the match, you really need to stick with your allies and use them to help shield for you or else you'll typically go down faster. Also try to revive your allies if it's safe. I can't recall who I played as, but I'd suggest someone tankier or with escape potential. Soldier, 80's, and Captain will struggle since they lack defense and escape tools for the auto aim champs you will be facing. Slide can throw in her tornado for DPS since AI rarely seem to detect it to flee while also using her orb to send the Chomper away from allies as they also don't flee/kite him... they just eat the bites. She is squishy though and has to be careful. Engie has his turret and stun to help your allies win fights. Space Cadet may be a decent pick as you can adopt the AI Space Cadet as she is probably the most suicidal of the group. Super Brainz is OP, so he may work out... but he is also a large target and getting into the fray with one plant can quickly go bad if a Pea Shooter shows up. Lastly, the Acorn is the most profitable enemy to take down since he is the weakest link by far. While the Oak, Peashooters, and Chomper are high threats.
Did you manage to beat Town Center (plants)'s 4th chest? I think it's still the hardest of the ones I've done. I barely beat it with 3 players (one of them needed) the other night after multiple attempts.
