And if you are bringing cards to move, you can get immediate reactions from dealers and fellow collectors without dealing with shipping, fees, or waiting on offers online
These promos will also be more widely touted as a source of flavor and worldbuilding, allowing talented artists (or art directors) to define a chunk of the worlds visual flavor without restrictions
You might lean PSA for the name recognition, or CGC if you want to save on fees
Id recommend reading the following in particular: Fan favorite Pokmon/historically popular Pokmon Cards that are hard to obtain e.g
Rydia, Summoner of Mist lets you find new cards and recur Saga creatures, while Gladiolus Amicitia hits hard turn after turn
1 2 "Analysis of Pokmon GO: A Success Two Decades in the Making"