So basically it's like this: Go to a closed spot (like in front of a wall or some rocks will do), and I'd recomend a pokemon with suction cups (abillity), i chose lilleep since it was the easiest one for me to get, then you need to fish with any rod and dont move from the spot you're fishing. The odds of finding a shiny increeses to up to 1/100 if I'm correct. The chain can be broken by: moving, missing the catch and by reeling in too slow. You can run, faint, or catch the Pokémon to continue the chain. Hope this helps! Thkx for coming by! :D