Originally Posted by Dorei0sama

Just use one crappy unit and rely on one helper unit with 800+ speed.

Explanation? And why 800+ Speed?
In the best possible case = the Helper got all the right RNG nodes, you have only 25% chance with the top RNG Node since you have to walk on it at least 2 times to kill all Pests and Boss. That single Node makes you lost 75% of the time just by itself with only 1 Team. And knowing you have only 12.5% (1/8) to reach to middle Boss at each turn (if you are lucky to enter in the middle of course), every time you fail you have to walk again on the top RNG Node = 50% fail...