You can get Aerodactyl the same way you get it in the official games, just smash rocks in Glittering Cave until you find an Old Amber, then take it to the fossil lab to be revived. Might take a while to find one but they're definitely available.
There are one or two small text changes, but they're not important so you can safely play it in Spanish. The edited title screen won't appear in non-English languages, but all the game play changes will work fine in any language.
Yeah, I'd recommend Rebalanced or Legal, depending on whether or not you like the Pokemon changes I've made. They have very similar difficulty levels, so which one you play is just up to personal preference.
hi alpha! sorry, i forgot to show you an edit of your poipole sprite! but i'm not on my computer right now, so i'll try showing you tomorrow :)
but no, sadly there aren't any tutorials for resizing. you just have to keep practicing and keep looking at official sprites to see how to outline things properly. i'll see if i can make a tutorial for you some time soon
pretty good :) but you'd have to practice making smaller sprites. this pokemon is supposed to be kinda short, so i'd day practice with making the sizes more accurate
the line art is pretty good actually :) but it could be a bit cleaner. notice how some of the lines look a bit bulky whrte they shouldnt be bulky (like the right side of his "ear") and the spike on his tail