it is 67 steps after u enter route 209. pass all the people and water then u will see the hallowed tower on a little patch of sand next to 2 small rock
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if you look at your map, you will find hallowed tower to the right of hearthome city, on route 208. keep walking to the very right and the pile of stones is the hallowed tower once you insert the odd keystone
You can find Spirtomb in the Hallowed Tower on route 209.
You can find the HM strength at the top of the lost tower south of solaceon town :)
you do not find dialga in Pokemon pearl
in the lost tower on route 209 i think on the last floor and if its night time you can find mismagios