A jumbo pearl is a rare item with a rare value to find this you must search the piles of bones under water in area 10 and 11 i suggest you do the red coral quest because this quest increase's the number of bones.
If you have online (the city) there is event quest called "the moltey mission" that is on now and then.In this quest you must kill two royal ludroth in the water arena if you do this you will obtain a jumbo pearl as a reward.
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It is extremely rare underwater looking for it, but I got most of mine from the hunting fleets offline looking in the treasure areas.
Monster Keenbone is randomly dropped from the following large monsters (High-Rank, 6 Stars+ only): Anjanath (High-Rank, Ancient Forest) Barroth (High-Rank, Wildspire Waste). ☺
There are several places in which you can find killer beetles: Flooded Forest: Areas: 2,4,7,9 and 10 Volcano: Areas: 1,2 Although you can find killer beetles in the flooded forest, it is much easier to get them in the volcano.
you do not find dialga in Pokemon pearl
The Only way to defeat or find Acidrake is to click battle monster, there is no quest to find the monster/