Evolution is the combination of two of the same cards to make a stronger card of the same type. A card that has not been evolved yet is refered to as a Base. There are 3 stages of evolutions: Evo 1, Evo 2, and Evo Max. The bottom of each card contains a bar that displays what stage of evolution a card is at.
A percentage of the 2 base cards carries over to the new evolved card. The new evolution recieves 7% of the stats from each of the two cards used if they are enhanced, giving the new evolved card 14% higher stats than the cards used to form it. In order to maximize a card's stats, it is highly recommended that you fully enhance cards before evolving them. Unenhanced cards will only transfer 4% of their stats. Evolution also increases the card's HP by 250 per evolution level. This is a set number and is not based on the number of Base cards involved.
Also note that when combining two cards the resulting evolution will have it's enhancement level reset to 1.
There are a vast number of different possible ways to evolve a card depending on number of bases involved and number of cards that are fully enhanced . Below are a few major evolution methods. The difference in the increase of final stats of a 8-15 vs 4-7 evolution is only a little over 3%. This is relatively small but over a deck of 18 cards it could add up. The only question is whether it is worth it to you to spend the extra resources to go for the full 8 card method.
The 8-15 Evolution:Edit
The 8-15 evolution results in the highest possible stats for your Evo Max card. It requires 8 Base cards and requires you to fully enhance 15 times. Failure to fully enhance at every point along the way will result in an improper evolution and less than maximum stats.
The final stats of a proper 8-15 Evo Max can be roughly estimated by multiplying the stats of the fully enhanced base by 1.481544.
For example: The max ATK of a Base 5* Master Yoda is 9140. 9140 x 1.481544 = 13600.57392. It can therefore be assumed that the max ATK of a Max Evo 5* Master Yoda would be about 13,601 depending on how rounding is handled.
The 6-11 Evolution:Edit
This evolution uses two 3-Card [Evo 2] to make the [Evo Max]. The final stats are higher than a 4-7 but lower than 8-15.
The final stats of a proper 6-11 Evo Max can be roughly estimated by multiplying the stats of the fully enhanced base by 1.470372.
For example: The max ATK of a Base 5* Master Yoda is 9140. 9140 x 1.470372 = 13439.20008. It can therefore be assumed that the max ATK of a Max Evo 5* Master Yoda would be about 13,439 depending on how rounding is handled.
The 4-7 Evolution:Edit
The 4 Card Evolution requires only 4 Base cards and 7 enhancements. The Good: It only costs half the cards and credits of the 8-15 evolution. The Bad: The Evo Max version will have slightly lower stats than the 8-15 evolution.
The final stats of a 4-7 Evo Max can be roughly estimated by multiplying the stats of the fully enhanced base by 1.450086.
For example: The max ATK of a Base 5* Master Yoda is 9140. 9140 x 1.450086 = 13253.78604. It can therefore be assumed that the max ATK of a Max Evo 5* Master Yoda would be about 13,254 depending on how rounding is handled.
The images above are edits of the examples on the RoB Wikia. Credit to Ecksofa, the creator of the originals.
Other Misc. Evo Formulas:Edit
If u want a formula for a specific evolution leave a comment or send a message to MetalGeekMark .
Partial Evo Formlas:Edit
These can be used to determin if an Evo1 or 2 that has not been fully enhanced is proper.
Proper Unenhanced (Level 1) Evo1:Edit
(Max Base Stat x 1.14) - (Difference between Base and Max Stat)
So for Yoda 5* ATK:
9140 x 1.14 = 10419.6
9140 (Enhanced) - 6740 (Unenhanced) = 2400
10419.6 - 2400 = 8019.6
So if it was properly enhanced before evolving it would have about 8020 ATK.
Proper Max Enhanced Evo 1:Edit
Max Base Stat x 1.14
Proper Max Enhanced 3 Card Evo 2:Edit
Max Base Stat x 1.2898
Proper Max Enhanced 4 Card Evo 2:Edit
Max Base Stat x 1.2996
Evolution Stats SpreadsheetEdit
Click Here: http://bit.ly/swfcevos
It seems as though when you evolve cards, you get the maximum skill level of the 2 cards evolved
level 10 and level 1, new card is level 10
level 10 and level 2, new card is also level 10