I made this math before thinking hard on skills

Strength (Str) is the amount of damage dealed, it can get up to 99.999, Spirit (Spi) can get to 99.999 too, but half of it goes to the damage and defense.

With those two stats at max you get the Digimon base max damage, you can also get another pair of 99.999 with equipments.

99.999 (Str) + 99.999 (Str Equips) + 99.999 (Spirit + Equips)

299.997 (Max Basic Damage)

299.997 x 1.4 (Both advantages)

419.995

419.995 + 50% (Max Damage Boost Trait), 50% is 209.997

629.992

629.992 % 2 (Max Defense Boost Trait), half

314.996

314.996 -299.997 (Max Defense)

14.999

14.999 x 2 (You get lucky with a Critical Hit)

29.998

7 Normal Hits (104.993, more than max HP)

6 Normal Maxed Single Skill Hits (102.473, It adds +1980 to the Initial Damage 17.078)

5 Best Maxed Skill Hits (112.492, Best skill is damage +50% 14.999>22.498)

4 Critical Hits (119.992)

Which means, you have to be lucky to even have the chance of defeating an maxed enemy without reacting

Well, at the begining and at the end there is a really small bonus of +1 to +3 damage, but it wouldn't make a big difference.

Even if skill damage is ok, i'm not sure about cost and lvl, i set 99 levels and the cost and power varies, those in the examples just ÷ 99 and get lv1, you start with 20pp and can increase up to 99.999 proper cost? Spam? No use at the begining?

I also tough about choosing skills by yourself, build a nice team, choose type, rows, and all.