Hold the training for + awakening first, as I suggest you do that when you have enough megas to do so. Colosseum might be coming soon and you require 6 units. Do the beginner's advent event to farm fragments for WarGreymon and evolve your MetalGreymon. As of now, grind levels and collect plugins from the daily event.

From the beginner's advent event, you can only obtain 7 fragments, just enough to evolve 1 unit. Also, might not be smart to bring all the same element to Colosseum, a single AOE MetalGarurumon will wipe your entire team easily. As of now, evolve whatever rookie or champion digimon you have to Ultimate first, and you can progress the story with ease with a lvl 35+ champion.

As for digistones, hold on to 200 and draw the guaranteed mega multi. I suggest you do maybe around 2 multis and see how from there. I've done 2 multis, and my stone count are at 450 now. So total, I've grinded roughly around 800+ free stones.

Jessmon is one of the best speed and attack digimon.

Make sure it evolve to Jessmon with single hit skill.

I would say based on your preference. For me, I might play this game based on my preference for a certain digimon (especially on the original gen1 or anime Digimon). But it's better to have different elements/resistance in your team. Anyway, it's up to you.

Lol. Why 6 WarGreymon, bro?

u need a base wargreymon with max friendship max lvl and a fodder mega to rebirth/awaken,
during +1+2+3 U not necessary need to evolve them back to wargreymon, can go other path, but during +4 u just digivolve back to wargreymon
correct me if im wrong, from wat i read here is, all matter is for the +4

Yea, as far as I understand. Still many things have yet to be discovered. haha...

If a supreme canon skill, you my consider on training him to +4 or keep drawing.

I would stop drawings and up him + get another mega (Beezlebmon, Jesmon etc)