Manic

I got a lil' question, I'm new-ish to this. I usually use a wood R4 with the cheatusrc.dat file to be able to use the cheat codes for my game. Sadly the dat file only has the cheat code for Celebi and the anniversary Mew, I'd like to add the Ash's pikachu and the 3 legendary beasts but I have no idea how. I'm wondering if anyone knew and could help me. Thanks.