Actual Battlez Arena, Jade League. High of 6.32 million (link below). Free to Play (F2P) strategy using only free plants, based on TheRealGamer's, but all 3 Roman Caesar Zombies are undefeated, unfortunately. Plant Food (PF) are used on Power Tiled Imp Pear (IP) and Primal Potato Mine (PPM). Very inconsistent and dependent on RNG, average was over 3.2 million.
Timing of PF use is important: try to hold out until a PF tombstone is spawning and when there are Zcorpions, as most of the time they are the primary target. After the 1st set of tombstones spawn, constantly plant IP and PPM when off cooldown to keep the zombies at bay. If you need to destroy a PF tombstone in front of a Zcorpion, plant Grave Buster the moment after it fires.
Previous tournament: Ultomato's BOSS FIGHT Tournament. Ultomato & Friends vs. Zomboss! Ultomato's Dino Boss Fight
45.9 million (Free Plants Only, my highest score): https://youtu.be/JbSjfN2pqIw
43.7 million (Free Plants Only, my original strat): https://youtu.be/j-8p9V8nQz0
Plants vs. Zombies 2: It's About Time Statistics For TheMaruMari
TheMaruMari presently has 379,751 views for Plants vs. Zombies 2: It's About Time across 1,808 videos, accounting for over 4 days of watchable video on his channel. This is 48.28% of the total watchable video for Plants vs. Zombies 2: It's About Time on TheMaruMari's YouTube channel.