you can go to esc -> settings -> utilities -> dump storyline strings and click "run utility". now go to your pokemmo folder and find the dumped files in PokeMMO\dump\strings. you should be able to edit the movenames in the IRB 0 file since thats where the game should be pulling most stuff from. just open it with a text editor of your choice and find the moves via search ctrl + f. the move names appear at multiple places so you gotta figure out for yourself what you need/want to change in detail.
oh and make sure to move the dump file into your normal strings folder PokeMMO\data\strings, else nothing that you change in the file would matter at all. good luck with that i guess. i think it would be easier to find a rom in your language instead of translating it yourself tho.
if you wanna change other dialogue: bpe is for hoenn and bpr is for kanto, you could actually put these changes into the strings en file or whatever language directly if you want to instead of moving the dump files. cpu 0 should be sinnoh, ipk 0 johto and irb 1 should be unova i think. youd have to put these files into the strings folder.
the files also need to match the client language you are using, the language code it says at the top in the file and i think in the name too.
tbh i didnt mess with this a lot in a while, so i hope i didnt miss anything.