They don't generally do anything different to the standard version of the card - a promotional Pikachu and a regular Pikachu have the same effect in battle - but they have a different appearance, artwork, and depending on who you talk to, a certain amount of prestige
These cards, which have all been verifiably sold (anything is only worth as much as someone will pay for it), have each fetched their owners a great sum of money
The limited-time nature of the McDonalds collections makes them desirable for collectors, but if youre keen on getting them, its worth waiting, as prices tend to dip after the initial buzz dies down
Other important information about this card
(2022-02-18) If an effect that causes a Vehicle to become a creature doesn't specify its power and toughness, it has the same power and toughness that it would normally have if it were crewed