if that happens, there have to be balances between levels in party and the pokemon wild or battle. As for the experience given would is the differences between the two or more pokemon added and then divided for the average percent of your team [X average number /dived by # of pokemon taken out. Fainted are excluded as always]. As for the wild pokemon who are solo, their raw experience they would give is [Raw Experiece/ # of pokemon taken out during battle]
Example: A
Your team level(s): 10, 10, 10, 10
10+10+10+10=40
Your partner level(s): 10, 10, 10, 10
10+10+10+10= 40
Average level of Party: 40/40= 1
RAW EXP * (times/multiply) Average level of Party= 100% of RAW EXP
RAW EXP from wild/battle if it is a BATTLE of 2 on 2
meaning if the average is 1, put it in PERCENT form so your exp gaining is the RAW experience fully
If it is 1 on 2, your exp is half
Example: B
DoubleYour team levels: 54, 60, 75, 3, 100, 66
sum of levels: 358
Your partner levels: 10, 50, 50, 41, 30, 2
sum of levels: 183
Average level of the party: 183/358 =0.5112 approximated (as you can see right here, the numbers works the same way as PROPER math does)
RAW EXP: 500
RAW EXP (500) * Average level of the party (0.5112)= 255.58... so in the game the number would be 256 since the EXP number shown does not have decimals.
so your PERCENT EXP is 51.12% of that amount of RAW EXP
Single (1 on 2)
Followed from above on continuation
RAW EXP 256/2 to be half since= 136
Hope you understand of what I mean. Tried my best to keep it easy to follow... =/ Ask if you need another example.