Okay so

You know "Double Dipper"? Where Dipper has like this giant list of what to do with Wendy?

Look at the bottom of the list

Monstermon

Monstermon

Monstermon

MONSTERMON

MONSTER FREAKING MON

POKEMON EXISTS IN GRAVITY FALLS

AND DIPPER IS A HUGE NERD ABOUT IT

FORGET FORD

FORGET THE WHEEL

FORGET EVERY SINGLE CRYPTOGRAM AND HINT SO FAR

THIS

THIS RIGHT HERE

THIS IS THE MOST IMPORTANT DISCOVERY OF ALL GRAVITY FALLS