== ROOT FOSSIL (EX:Sandstorm) [See also "CLAW FOSSIL" and "MYSTERIOUS FOSSIL"]
* While in play, Mysterious Fossil, Claw Fossil, and Root Fossil, count as both Trainer cards and as Pokémon. Previous rulings did not consider them to be "Trainer cards" while in play. (Apr 5, 2005 PUI Announcements; Apr 7, 2005 PUI Rules Team)
== CLAW FOSSIL (EX:Sandstorm)
* While in play, Mysterious Fossil, Claw Fossil, and Root Fossil, count as both Trainer cards and as Pokémon. Previous rulings did not consider them to be "Trainer cards" while in play. (Apr 5, 2005 PUI Announcements; Apr 7, 2005 PUI Rules Team)
==MYSTERIOUS FOSSIL (Fossil Expansion; Legendary Collection; EX:Sandstorm; EX:Legend Maker)
* While in play, Mysterious Fossil, Claw Fossil, and Root Fossil, count as both Trainer cards and as Pokémon. Previous rulings did not consider them to be "Trainer cards" while in play. (Apr 5, 2005 PUI Announcements; Apr 7, 2005 PUI Rules Team)
Q. At the beginning of the game, can I start with a Mysterious/Claw/Root Fossil as my Active Pokémon even if I have another "real" Pokémon on the bench?
A. Yes, you can start with a Fossil Trainer card as your Active Pokémon, at the start of the game. (Oct 2, 2003 PUI Rules Team)
Q. Can I evolve Lileep or Anorith from a Mysterious Fossil or not?
A. No. Mysterious Fossil, Claw Fossil, and Root Fossil may not be freely interchanged to evolve into a different Pokémon than normally listed. (Sep 11, 2003 PUI Rules Team)
Q. Can you use trainers like "Pokémon Fan Club" or attacks like Dunsparce's "Strike and Run" to search for a Fossil trainer?
A. No. Fossil Trainer cards are only considered Basic Pokémon while in play, or in the special situation of starting the game. You cannot search your deck for them as if they were Pokémon (Oct 16, 2003 PUI Rules Team)
Q: Can cards like Multi Technical Machine 01 or the various Mystery Plates be used by Mystery/Claw/Root Fossil to provide a usable attack?
A. Mysterious/Claw/Root Fossil states that it "has no attacks of its own" which does not preclude you from giving one to the Fossil which it can attack with. (Sep 18, 2003 PUI Rules Team)
Q. The new Mysterious Fossil trainer from EX:Legend Maker now has 50hp rather than the old 10hp versions. Does this mean that I now play the older versions as 50hp too?
A. Yes it does. Treat all Mysterious Fossil cards as if they have 50hp. (EX:Legend Maker FAQ; Feb 16, 2006 PUI Rules Team)