This site is not for solicitation of services or 'purchasing' development. Please do not post requesting side mods/plugins and so on. Your thread will be removed, and you will receive a warning.
Now what you have to do:
Click on "Edit Profile". and go to the last part, Java Settings (Advanced)
It should appear like this:
Only change the -Xmx number to something like -Xmx2G.
Pixelmon Launcher