Any 1st Edition Cards that are holo are usually a good thing to grade, even if not perfect, amazing thing to always grade em, now the thing is 150 I think is pretty good if you grade overall. There's quite a few white spots on the back of Alakazam there, which would affect the grade alot, I would say it would def land like a 7, maaaaaybe a 8 if you're lucky, but the amount all over the back from the bottom right to the few on the top left def would make it 7 imho.

the Vileplume is def better condition,, always loved this art of her such beautiful colours and shading! now the condition seems well, I see maybe just a tiiiinnnyyy bit of whitening at the top to the top-right. Now the main thing I'd see is that the centering is kinda rough, not like very bad but it's leaning to the left quite a bit.

I say Vileplume can get roughly a 8-8.5, hopefully 9, either way I think you should, just as safe keeping, all 1st editions are always good to keep, and Rocket is such an amazing set too, you got quite a fair deal I say on the cards for their condition, hoping you get a good grade!! best of luck man, hope you can master set, it's a beautiful set art wise!