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Nope, sadly you can't. I had a similar problem with my cells, as i was stuck at 99/100... turns out i wasn't missing a cell, but a core. So try and look for those!
From 30 to 255 chained pokemon you have 4 guaranteed IVs. After the 255th encounter, the system 'resets' and starts counting from the beginning again, so the 256th pokemon will have no guaranteed IVs
I wouldn't mind trading you one, but be advised that the encounter rate for a bagon is extremely low, and that the chain required to get a salamence is usually very long and straining for a low-level team
Requested Pokémon: Turtonator, Lv41-50
In Game Name: Matt
Deposited Pokémon: Scyther, Lv 1
Your Message:I want to trade for a Pokémon that is strong in battles.
Thank you again
Requested Pokémon: A-Marowak, Lv41-50
In Game Name: Matt
Deposited Pokémon: Ghastly, Lv8
Your Message:I want to trade for a Pokémon that is strong in battles.
Thank you for your kindness!
I personally prefer a pokeball that looks cool on the pokemon, but if it's a regular one it's absolutely not a deal breaker to me.
Gender and IVs also have a limited importance. If someone is so kind to host a giveaway, but the pokemon doesn't have every single thing someone is looking for...