About the new battle UI I explain what I think and I'm putting some gifs and images as an example, I hope you understand.
About the new Battle UI I thought a lot and I came to a conclusion about doing a Battle UI based on the old one, because I think the old one is very good, and I think it would be better to recreate it because if I create a new Battle UI, I think it would bother a lot of people who hunt all day and for those people who play the game on the cell phone. So I decided to recreate the old one trying not to disturb the people who play the game on the cell phone and for those who are hunting pokemons all day.
Battle 2v2 and 3v3 fights:
For 2v2 battles could work with the first two pokémons of your list.
For 3v3 battles could work with the first three pokémons of your list
Example:
In the example I put the video of the Ash playing the pokeballs because I had not found an animation on the internet just playing the pokeball.
Button for Megas:
For the megas I think it should stay down as it is there in the example.
Example:
Button for Z-Moves:
For the Z-MOVES I think it should stay down as it is there in the example.
Example:
Button for Cancel:
For the Cancel I think it should stay down as it is there in the example.
Example:
Battle Logs:
I think it would be nice to create a button next to the logs, as soon as it clicks the button will appear the logs next. Because there are people who get pokemons all day long, and with the logs appearing this right away I think I could mess up these people who are hunting many pokemons. More information looks at the example below.
Example:
Buffs, Paralyzed, Taunted etc:
Paralyze, taunts, buffs and etc. I think I should stay in below life because I think it would look cool because it was going to look like the other pokemon games! Paralyze, taunts and etc. should appear before, and the buffs soon after. More information looks at the example below.
Example:
Then in the example you will see that he took Paralyze, it is because the pikachu used an attack and gave paralyze in Eevee, and the Paralyze appeared before the buffs.
Weather and room effects as well as their turn count:
The weather and counting should be right there in the upper right corner, showing that she is in such a Climate and showing the count of turns that she ends up. More information looks at the example below.
Example:
Extra:
I think it would be nice to put a percentage of the Pokémon's life at the time of battle.
Example:
I made some changes in the post to put the bigger gifs because they were too small and hard to see.
Thank you for your attention. :D