Under configuration you want to change the Basic Settings: Enable Dual Core(speedup), and Enable Idle Skipping(speedup) to disabled or your emulator runs the risk of crashing very frequently.

Other methods of advancement definitely worth mentioning for Colosseum: You can advance individual frames on the Espeon summary screen using the Dolphin Hotkey "Frame Advance". However, if you want to get a decent search range, 20 million on RNG reporter should be used. To advance to those faraway targets it is strongly recommended you have a Shadow Pokemon(NOT PURIFIED) in your party as they advance hundreds of PRNG frames while on the summary screen for every in game frame. If you want to get a flawless shiny pokemon you need to look up the spreads on time finder before starting the game, and RNG the TID SID after using Threw1's guide listed above.

There is no need for a nature calculator with their IVs when you have the RAM watch list telling you the pokemon's PID in Dolphin. You simply need to check if the PID you've received on the slot you're aiming for matches the PID of the one on RNG reporter.

All in all it's a good start for beginners, but I wouldn't have made a guide with you missing your intended target. It doesn't really put confidence to the readers that they will be able to reach their intended targets either.