How to make we BITs max and infinite?

what should i do

you need to get far enough in death valley so that you can do a mission on a boat you need
to shoot down the slug people while trying to free the digi-elves.(you can do this mission
however many times you want.) one of the elves you need to save so you can unlock the
undead yard mission. clear the undead yard by beating all 279 enemies within 30 minutes
with agumon and you will unlock Wargreymon X