Can a shiny Pokémon be identified apart from the sparkle and colour?

Suppose you play Pokémon with the sound off, and without paying much attention to the screen. Suddenly you notice a wild Pokémon battle has started. You think it might be a shiny, but you didn't see or hear the sparkle at the start because you weren't paying attention.

Worse, you don't have Bulbapedia to hand, so you can't look up the sprite for comparison. You don't have any cheating devices either.

Is there another way of determining if that Pokémon is shiny?

Solution 1:

Pre-battle you can see the grass sparkle when you use the Poke-radar. For example

This doesn't actually help if you aren't paying attention though, but it's the only other way I know of to determine if a pokemon is shiny or not.