In the actual Yu-Gi-Oh! Trading Card Game (TCG), Winged Dragon of Ra cannot directly defeat Exodia the Forbidden One. Here's why:
* Exodia's Victory Condition: Exodia wins the game the moment all five pieces are in your hand. There's no monster battle, destruction, or specific card effects required to trigger this.
* Ra's Abilities: While Ra is a powerful monster, its effects are focused on dealing battle damage, destroying monsters, and preventing damage. None of these actions can prevent Exodia from winning.
However, there are ways Ra could *help* against Exodia in a duel:
* Destroying Exodia Pieces: If Ra is on the field, it can potentially destroy Exodia pieces in the opponent's hand with its "Destroy" effect. This would make completing Exodia harder.
* Preventing Summoning: Ra's ability to prevent damage could be used to stop your opponent from summoning Exodia pieces from the hand or deck.
In a "hypothetical" scenario where we ignore TCG rules:
* If Ra were to somehow have an ability that could directly target Exodia in the hand, it might be able to "defeat" it. However, this is not how the cards work in reality.
Remember: The key to winning against Exodia is to prevent your opponent from assembling all five pieces. Powerful monsters like Ra can certainly help with that, but the victory condition is still Exodia's to fulfill.