@Donavon made me do testing in return for colored lessers. 
You may have heard that I hate skilling so I train things as they are.
I took out two 2 slot fresh pets. Ram and Kirin Kirin has 76 wrestling ram has 43 wrestling.
I took them to the same place and trained them from 0 to 100%
The average gain for a 2 slot pet is .7% per gain. It is sometimes more sometimes less.
The ram took 1 hour 40 minutes. I use Empowerment sometimes when I can. But I was mostly healing the weak beast. Also used whispering. I cant tell if whispering or power hour do anything when training on mobs out of your pets wrestling range.
The Kirin was much better. Took only about 50 minutes.
I was able to gain the 100% on the same crazy mage and was alone the whole time. Only trained one pet at a time.
Results:
2 slot pets get greatly gains of .7 on average. I noticed some same % points. I only wrote down one. Both pets happened to be at 87.5% at some point. That is 125 gains at .7%.
Train 1 pet at a time. Heal the dang thing you don't need a tank unless you want fewer gains.
Today I took the 2 pets out and used on same mob. But new name. They are both at 3 slots now and have same wrestling as yesterday.
The ram was first. Took 15 minutes to get to 52.24% Then it stopped. The average near 2.5% per gain.
The kirin was next. It took 4 minutes to get to 52.24% and it stopped also. I only used whispering on the ram. the time limit hadn't reset for the Kirin.
52.24 is 21 gains at 2.48%
Results:
3 slot pets get greatly gains of 2.5% on average.
Higher wrestling gets more gains/time.
I also have noticed higher slot pets tend to stop gaining faster on mobs vs lower slot pets. Some mobs are 1 pet gainers. Crazy mage is one of them. Don't bring a tank to the crazy mage.
~~taking donations of trainable colored pets on LS~~
You may have heard that I hate skilling so I train things as they are.
I took out two 2 slot fresh pets. Ram and Kirin Kirin has 76 wrestling ram has 43 wrestling.
I took them to the same place and trained them from 0 to 100%
The average gain for a 2 slot pet is .7% per gain. It is sometimes more sometimes less.
The ram took 1 hour 40 minutes. I use Empowerment sometimes when I can. But I was mostly healing the weak beast. Also used whispering. I cant tell if whispering or power hour do anything when training on mobs out of your pets wrestling range.
The Kirin was much better. Took only about 50 minutes.
I was able to gain the 100% on the same crazy mage and was alone the whole time. Only trained one pet at a time.
Results:
2 slot pets get greatly gains of .7 on average. I noticed some same % points. I only wrote down one. Both pets happened to be at 87.5% at some point. That is 125 gains at .7%.
Train 1 pet at a time. Heal the dang thing you don't need a tank unless you want fewer gains.
Today I took the 2 pets out and used on same mob. But new name. They are both at 3 slots now and have same wrestling as yesterday.
The ram was first. Took 15 minutes to get to 52.24% Then it stopped. The average near 2.5% per gain.
The kirin was next. It took 4 minutes to get to 52.24% and it stopped also. I only used whispering on the ram. the time limit hadn't reset for the Kirin.
52.24 is 21 gains at 2.48%
Results:
3 slot pets get greatly gains of 2.5% on average.
Higher wrestling gets more gains/time.
I also have noticed higher slot pets tend to stop gaining faster on mobs vs lower slot pets. Some mobs are 1 pet gainers. Crazy mage is one of them. Don't bring a tank to the crazy mage.
~~taking donations of trainable colored pets on LS~~