-Build your teams in gen8nationaldexag, as movepools are determined by this metagame. Don't forget to not put any items and put the No Ability ability to each pokemon.
-Don't forget gen1 mechanics! Most moves work the same way they worked the gen they were introduced (for example, Draco Meteor is literally gen4 Draco Meteor). There is a few exceptions you can find
here, though don't worry these are quite specific moves anyway.
-If you don't want a Pokemon to go full DVs in each stat(=EVs/IVs equivalent in gen1), use the gen2 builder, which allows you to manage DVs system. As mg1 works with gen2 hidden power, you will need specific DVs for each hidden power, which will be set automatically if you select Hidden Power in your Pokemon's moveset and press Enter.