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I don't see any tell tale signs of it being fake, but you've definitely gotta be cautious when it comes to valuable cards like this since they may be more likely to be convincingly copied. Do you have a UV light handy? https://www.cgccomics.com/news/article/8890/fake-pokemon-charizard/
A legitimate 1st Edition Base Set Shadowless Charizard can fetch tens of thousands of dollars—sometimes even hundreds of thousands—in mint condition. Ungraded, there are a few that have sold for about $4,000 on eBay this past month.
EDIT: Whoops! Yours isn't 1st Edition. That makes a big difference in the value, bringing it down to somewhere around $500. Sorry 'bout that!