I wanna make a new enemy which is an edit of a Rex, I want it to be called an "Angrex", which is a Rex with angry eyes, red, is faster, and slides. How can I do this?There is no knowledge that is not power.
You would need Assembly knowledge, which you can find here.
For the sprite itself, there is a similar sprite though, it's the Dorapon sprite, from とっても YEAH!
^ You could at least link to the sprite or something so he can have an idea of what you're talking about...