This script adds following pokemon to your game (you have to provide your own OW sprites). It is an updated version from the current script tutorial, but modified so that if all goes in one script section.
Download & How to use
Add this script in a new section above the main (and below the compiler).
Save your game, and close RPG Maker (important).
Download this file
Now download these graphics
Go into your game folder, and from that to your Data folder. Add the Animations.rxdata file you just downloaded. It will ask if you want to replace the current file, you will say yes.
Now, go back to the main folder, and go into the Graphics folder. From there, go into the Animations folder. Here you will extract the graphics you downloaded (emo.png, emo2,png, and Pokemon-Follow.png). Make sure to extract them, not just stick the .rar file in here.
How to use: read here