You need four other Team Rocket Pokmon in play and have to discard two Energy from your Benched Pokmon to use the move
I did this with R code, but it's possible (though tedious) to do by hand as well
Also, many claims the following Pokmon are rare to catch, though you can evolve some of them: Gyarados (can evolve from Magikarp ), Hitmonchan , Hitmonlee , Chansey , Magmar , Venusaur (final form of Bulbasaur ), Blastoise (final form of Squirtle ), Charizard (final form of Charmander ), Aerodactyl , Tauros , Snorlax , Lapras , Porygon , Kangaskhan , Alakazam , Mr
The artwork made by Shinji Kanda effectively shows off Roaring Moon's might , depicting it soaring over the player with its claws outstretched, ready to strike at a moment's notice