Is there a way of telling? Maybe a difference in music?
How to know when your chain breaks while fishing for shinies
pokemon-x-y
Related Solutions
As far as I know, the tips only contribute to a medal in PGL (Pokemon Global Link, if you sync'd your game with your Pokemon Global Link account):
And when you click on the link...
I don't know the exact threshold to get the medal nor I know if there are any more effects, but currently, I don't think there are any effects besides getting the badge.
There is a website/webapp that provides a Pokedex style Checklist.
Each Pokemon has a check-box next to it which you can tick to mark if you currently have it or not.
If it evolves, you can simply untick it if you don't have a duplicate.
I'm not sure how the site stores the information so I assume it's locally which means the moment you clear your cache/history etc, you may lose your checklist and unfortunately it's not up-to-date with X and Y Pokemon yet.
The website can be found here. I don't think there is an iOS or Android app though. Good luck.
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Best Answer
You have no definite way of telling. This is kinda why shiny hunting is so hard.
This said shiny fishing is the easiest way of getting a shiny because all you have to do is fish over and over again. As long as you get a Pokemon on each rod swing and you don't lose it, your chain still goes on. Get a Pokémon with the "Suction Cups" or "Sicky Hold" ability in the first slot, fish in a "corner" (where you block the only square to get out of there) and you should have a pretty good chance to satisfy this condition.
The best way you have to know is to keep fishing until you do get a shiny.