Originally Posted by Wii187
Mt Etumer is the best map since it avoids both forts and shrines (shrines can give symbols that add value to your GT).
I can also confirm win achievements will unlock with this method.
I'd like to mention that the map Colleseum II works like a charm for this as well and is available much earlier. You both have to pass through a fort but after that can go in circles at the top of the map, and with 10 turns you both will definitely pass that fort and stay tied since its only 6 spaces from the start. This should help ppl grinding cards/multiplayer before the single player campaign.