You actually can't post pictures in here. Generally speaking, you're not enabled to post any sort of content that the staff has no control over such as pictures as external links (possibly to prevent trolls from posting NSFW material).
Regarding the Legend cards, it's an old mechanic from the HGSS Era where you're required to have both pieces of the card (top and bottom half) in order to play them, so you'd need to trade for the top half if you wanted to use it.
That said, If I were you I wouldn't bother finding the other half unless you want it just for collection. Legend cards are only playable in the near-dead Legacy format. As a new player, you really should start off by playing Theme Decks for a while until you learn enough about the game to make your own decks. Then, you'd probably want to play Standard or Expanded rather than Legacy.
Even if you wanted to play Legacy, you'd need a ton of other Legacy cards like Junk Arms and Smeargles, on top of having to find multiple copies of both the top and bottom half of the Legend Suicune and Entei (assuming you want to use this card). And even then, Legend cards just aren't too viable in the Legacy format anyways.
Overall, I'd say just keep the card in your collection and don't bother using it xd