What you are discribing is the same as what final fantasy does since ff4 and it is an old system that has existed for a long time.
There is a fanmade pokémon game out there that uses this system and uses gen 2 graphics. The thing is stats and moves would have to change a lot because faster pokémon would be too OP. I know you want to defend weak but fast pokémon, but the most OP pokémon are already very fast pokémon and this would destroy the game even more. Dragon dancers would be almost impossible to stop and slow but high defence walls would lose their purpose because they would get detroyed before they could even do their moves.
The only thing I think that should get tweaked a bit is priority damaging moves. It is stupid that a lvl 1 ratata with quick attack could outspeed a lvl 100 +6 speed + max speed iv/ev + benificial speed nature speed forme deoxys.
I agree with you that there is danger of OPing fast monsters.My post was already too long and i tried to just give a short example.So i will try to make a conclusion in my hope.
First of all i am not a programmer so i dont know the exact solution,i just believe that a Summoner War style or FF or Crono trigger real time batle system or whaterver uses attack gauge should give a brand new breath.I have seen that more of the 70% of the pokemon community is so hardcore conservative to the current battle meta.The proof of this is that if you google "pokemon battle system change" you will find at maximum 10 articles in the last 5 years.I see that the community is affraid of critical changes and the main hopes are if there will be new starters or new region or contests or 8 badges system.All these are beautifull details but the main point should be the gameplay which is untouchable by most fans.
Secondly there are mechanics that can balance OP issues, like cooldown or use of stamina or a formula that calculates for example: Pokemon weight,speed stat,move priority,pkmn lvl etc.si in that case a LVL 1 rattata would need more time to prepare a Quick Attack on a LvL 100 deoxys or even snorlax.
Just to make my self clear i dont have a complete proposal for the gameplay.Just share some ideas from other games.My central point is if we want as a gaming community a new feel to our beloved game.Speaking for me personally i dont have problem.As i told before im too old by now and if the title stays stick to the 1999 concept and doesnt grow up a little in gameplay terms it will be probably the last pokemon game for me cause after 17 years im tired of this push A,wait,push A wait system.After alla these hardware and software upgrades it is too oldscholl and unrealistic in comparison to the mang /anime spirit that a monster is attacking and an ohter one is just staying there and takes the hit without dodgin-evading or defending itself.It is much more like chess.An other reliable battlesystem for pkmn IMO always, would be the Dragonball Xenoverse system that has the standard scriptted attacks but has alos some manual manuvers or moves or ultimate attacks that can be missed or require a skillshot or even a little skill to execute it.
It was fun in the Gameboy console but today in 2016 and the only change is the fancy 3D models.That is not a drastic change an evolution,it is just a nice outfit with the same content.
It was shame for me that even in ORAS i am in DELTA EPISODE i have a perfectly EV trained team but the game unfortunatelly does not attract me to keep playing.It is the first time i give up on a pokemon title before completing the story.
P.S. To give you a little bit more info about my profile i have bought Nintendo 3DS only to play heartGold and soulsilver because of the postgame Kanto visit and Pokemon Black and White 2 because of the Pkmn World Tournament whichh were amazing features.After i bought XY for the 3d battles and ORAS for nostalgia.But i played OR until Delta Episode and AS is still unboxed in my case...I dont blame my beloved rpg game but it seems that it reached its peak its maximum potential.It is time to get it to the next level if we want to see the Dream of every pokemon gamer some day.A multi-region MMO-RPG game like WoW someday.
P.S.2:The 1000% sure thing is that i will give a try to the S/M cause of the hype and if i see after Elite Four, that it has not at least another region this will be the last stand of pokemon for me.I am tired of all these disappointments in every title since Ruby/Saphire when i was waiting to defeat the Elite Four and i realised that there is nothing imporstant to do after this.