You do realize that chaining doesn't increase your chances of finding a shiny? The odds are still about 1/8000 no matter how high your chain goes. The only reason the Pokéradar is good for finding shinies is because it lets you find a lot of one specific Pokémon without being interrupted. For example, in my Sapphire, I was looking for a shiny Lunatone and I found a shiny Zubat instead
. If I had been in my Pearl, I could have used the Pokéradar to eliminate my chances of finding a Zubat and concentrate solely on Lunatones. However, even if I had a 100-Lunatone chain, the odds of finding a shiny one as the 101st would still be the same.