I agree with Yamite, the new pet battle skills are nice and a good refresher but some players lost lots of materials and time from making these battle pets that are now useless because of the skill changes. I recently just fused some battle and pray pets as well that are now basically useless because of the huge nerfs (40mspd to 20mspd) and Sunder armor/crystal snowball/blade fury ( 3000 Zodiac Sparkles + Pet coin bought to roll book skills). I think you should've asked the players before you launched the update for the Pet changes, or kept the old skills the way they are and implemented new different skills for battle pets. If you decide to keep the update and not revert the changes we should receive some compensation, such as the option to choose base pets and or specific pet skills.
This might seem a lot to ask for at first, but after you take into consideration the time and materials spent to acquire the pets it really isn't. Thank you for reading.