Under absolutely perfect conditions, yeah. That's about how much of a chance you would have. But two factors get in the way of that perfect scenario.
First, getting away from the numbers, it's probably something that most other trainers would frown upon. You're either waiting an hour for it to wake back up, ignoring everything else in the world for that time, or spending that time medicating a Pokémon just enough so you can capture it, which probably means it isn't going to like you. It's already lost once, now you're kicking it while it's down. Beyond that, all other factors such as hitting them with the net, finding the right terrain, buying the balls, and doing battle with this Pokémon. Which brings me to my next point.
Getting back to the numbers, that Level 100 is going to be armed with moves at around that level. This means, you are risking death of both your character and your Pokémon trying to capture it, since usually most Pokémon will have moves that will be fatal at that level. Here's an example, let's say you're trying to catch a Level 100 Purugly. Why? Because you like cats and it's shiny. It has Body Slam, which will be doing 3d12+10+the Purugly's Atk Stat. It's already faster than you, that's a given at it's level. It doesn't need a SP. Attack, so the GM can leave that stat untouched. We'll assume the GM is lazy, and therefore decides to split all of the Pokémon's stats evenly, between the relevant five without worrying about Nature. So it will have 30 ATK. Maximum damage will be 76 damage, enough to faint most PCs and early game Pokémon, if not kill some if they are injured.
But let's say the GM gave it a TM or egg move, something you would do if you were going to go crazy with a strong Pokémon. Giga Impact, because why not! That'll be a 5d12+25+30. Maximum damage would be 115, which is going to faint, if not kill someone. And this is all ignoring outside factors, such as Attack Stages or GM shenanigans that make the task more difficult.
Which begs the question why a GM would throw such a Pokémon at the party anyways, but that's a whole nother digression.