so :
10. My friend changed the EV's, Moveset and evolved it, what can I do?
The Pokemon returns the same way you gave it to him, so everything resets back!
About that: i think you can evolve the owners pokemon , get the evolution DATA , and probably will be reset to pre-evo form , but i'm not a test field/staff or anything ....
why:
14. Do lend Pokemon give Dex data?
Yes, they do give the owned data, the seen data AND the evolve data if you decide to evolve the Pokemon (note Q.10)
EDIT: give prehax a "like" did a very very good FAQ!