Certainly worth it. I got the Shiny Dratini. If you say that Black Tower takes forever, I say, "Anything for a Shiny." Say that Benga is tough, and I say, "Get a Lv. 100 anything. I had Scizor and Regirock, so yeah." Say that it's only level 1, I say, "I got my Lv. 1 Dratini to a Dragonite lv. 65 in a week." Plus, a Shiny Garchomp will kill everything. So, yah. Do it.