To raise a chara's Skill Level, make sure you use an EXACT copy of the card as the Practice Partner, provided both are Skill-1. The one taken to practice, should be Skill-2. You'll need another Skill-2 copy to turn the chara Skill-3. And so on, till the card reaches Skill-8.
You'll need this number of Skill-1 copies to raise each skill level, each number representing the corresponding Skill Level (Practice tho!):
Equations WON'T be accurate, the numbers represent the Skill Levels not normal digits
Remember that equations indicate Practice sessions with the number on the left of the + being the trained member and the one on the right being the Practice Partner, do them to be able to raise the original's Skill Level (I maxed out at 3 for now)
- 1 copy, pretty much normal.
- 2 (1+1=2)--use one as the other's Practice Partner, use the resultant Skill-2 as the original's Practice Partner
- 4 [(1+1)+(1+1) > 2+2] then proceed to training the original with the Partner the resultant Skill-3
- 8 [(2+2)+(2+2) > 3+3] then proceed to training the original with the Partner the resultant Skill-4
- 16 [(3+3)+(3+3) > 4+4] then proceed to training the original with the Partner the resultant Skill-5
- 32 [(4+4)+(4+4) > 5+5] then proceed to training the original with the Partner the resultant Skill-6
- 64 [(5+5)+(5+5) > 6+6] then proceed to training the original with the Partner the resultant Skill-7
- You've maxed out your Skill Level. No 9!
Remember to point out any mistakes if any exist. This is based on what I calculated with the fact that Skill Levels rise when a Practice Partner is another copy of the trained member with the same Skill Level.