Charizard is a pretty powerful being and one good shot could easily take out a Sky Scraper and probably take out the entire (planet) city. Veemon is one of the stronger Digimon out there and he does have a decently high amount of attack power. His Mega form will be able to match up against Charizard’s and even pull out a win. The decisive factor in this round is Veemon’s long range capabilities. Veemon wins.
Link to Original image by Phatmon66 posted below
http://phatmon66.deviantart.com/art/Showdown-Black-Charizard-vs-Flamedramon-314281121
DReager1.com 
Veemon would own even mega charizard in his two royal knight forms magnamon and ulforceveedramon
Those forms are insanely strong so I definitely can’t argue against that all that much
This was boring to read
Actually I thought it was pretty hype tbh