Youll also need the entry fee for the tournament, as well as money for your incidentals (food, drink, Public Events, etc.)
The amount of Pack Point each card costs is tied to its rarity, meaning, just like with the physical ones, Pokmon TCG Pocket cards follow the rule of - the rarer it is, the more it will hurt your bank account
To kick this list off I want to address some of the best looking cards form Set 6, Wings of the Captain
Kangaskhan Holo Family Event Trophy Card No surprise, another card from the first generation of Pokemon makes the list of most expensive cards
Saboteurs and ninjas come to mind, and there's lots of room for creativity with this Esper commander