Pokémon Diamond and Pearl/The Lost Tower

The Lost Tower is a place where trainers can mourn their deceased Pokémon. It's home to various Ghost Pokémon and at the top you will receive two items from the towers overseers.

Lost Tower exterior

In Diamond and Pearl, there is really only one reason you need to go here, and that is for HM04 Strength. There are a few other items here, but the trainers are fairly weak, so grab what you need, battling the trainers along the way. On the fifth floor you will see two old ladies. One will give you HM04: Strength. The other lady will give you a Cleanse Tag. This item, when held by your lead Pokémon, reduces wild Pokémon encounters by 50%. You're done here for now, so go ahead and head on out!

In Platinum, you won't get Strength here so it's optional to go in here but do grab the ghost Pokémon in here. If you do decide to go up you will need Defog after 2F

1F

Pokémon found

Diamond
Pokémon		Level	Morn.	Day	Night
	Zubat	16-18	50%	50%	40%
	Gastly	16-18	50%	50%	40%
	Murkrow	17	-	-	20%

Pearl
Pokémon		Level	Morn.	Day	Night
	Zubat	16-18	50%	50%	40%
	Gastly	16-18	50%	50%	40%
	Misdreavus	17	-	-	20%

Platinum
Pokémon		Level	Morn.	Day	Night
	Zubat	17-19	35%	35%	35%
	Gastly	17-20	65%	65%	45%
	Duskull	17-19	-	-	20%

2F

Go down after the stairs and go to the bottom right corner to find a hidden Stardust (DP). Go back towards the stairs and make the 2nd left to find Youngster Oliver and an Oval Stone. Head to the top left corner and go up the stairs.

Trainers

Diamond and Pearl
Trainer	Pokemon
Youngster Oliver Reward: 256	Stunky Lv. 16 Shellos (West Sea) Lv. 16 Kricketune Lv. 16

Pokémon found

Diamond
Pokémon		Level	Morn.	Day	Night
	Zubat	17-19	50%	50%	40%
	Gastly	17-19	50%	50%	40%
	Murkrow	18	-	-	20%

Pearl
Pokémon		Level	Morn.	Day	Night
	Zubat	17-19	50%	50%	40%
	Gastly	17-19	50%	50%	40%
	Misdreavus	18	-	-	20%

Platinum
Pokémon		Level	Morn.	Day	Night
	Zubat	17-19	35%	35%	35%
	Gastly	17-20	65%	65%	45%
	Duskull	17-19	-	-	20%

3F

Follow the path down and go to the left to run into Roughneck Kirby. Grab the Revive next to him then head up to find Pokéfan Leonard. Go to the top right corner to go up the stairs.

Trainers

Diamond and Pearl
Trainer	Pokemon
Roughneck Kirby Reward: 456	Cleffa Lv. 19
Pokéfan Leonard Reward: 1152	Pichu Lv. 15 Pichu Lv. 15 Pikachu Lv. 18

Pokémon found

Diamond
Pokémon		Level	Morn.	Day	Night
	Zubat	18-20	49%	49%	39%
	Golbat	19	1%	1%	1%
	Gastly	18-20	50%	50%	40%
	Murkrow	19	-	-	20%

Pearl
Pokémon		Level	Morn.	Day	Night
	Zubat	18-20	49%	49%	39%
	Golbat	19	1%	1%	1%
	Gastly	18-20	50%	50%	40%
	Misdreavus	19	-	-	20%

Platinum
Pokémon		Level	Morn.	Day	Night
	Zubat	17-19	35%	35%	35%
	Golbat	21	1%	1%	1%
	Gastly	18-21	64%	64%	44%
	Duskull	18-20	-	-	20%

4F

Go down after the stairs and you will run into Pokéfan Rebbeca. Just below her is Belle & Pa Beth & Bob. Continue left and you will find TM37 Return. Head up and just below the stairs is Young Couple Mike & Nat. To the right of them in between the two gravestones to your right is a hidden Great Ball (DP). Go back towards the Young Couple and up the stairs.

Trainers

Diamond and Pearl
Trainer	Pokemon
Pokéfan Rebecca Reward: 1216	Bonsly Lv. 19
Belle & Pa Beth & Bob Reward: 2128	Ponyta Lv. 19 Buizel Lv. 19
Young Couple Mike & Nat Reward: 2432	Murkrow Lv. 19 Misdreavus Lv. 19

Pokémon found

Diamond
Pokémon		Level	Morn.	Day	Night
	Zubat	19-21	45%	45%	35%
	Golbat	20,21	5%	5%	5%
	Gastly	19-21	50%	50%	40%
	Murkrow	20	-	-	20%

Pearl
Pokémon		Level	Morn.	Day	Night
	Zubat	19-21	45%	45%	35%
	Golbat	20,21	5%	5%	5%
	Gastly	19-21	50%	50%	40%
	Misdreavus	20	-	-	20%

Platinum
Pokémon		Level	Morn.	Day	Night
	Zubat	18-20	35%	35%	35%
	Golbat	21	5%	5%	5%
	Gastly	18-21	60%	60%	40%
	Duskull	18-20	-	-	20%

5F

Talk to the right woman for a Cleanse Tag and the left one for HM04 Strength (DP)/Spell Tag (Plat).

Once you grab these items you can leave the tower and head up into Solaceon Town.

Pokémon found

Diamond
Pokémon		Level	Morn.	Day	Night
	Zubat	20,21	40%	40%	30%
	Golbat	21-23	10%	10%	10%
	Gastly	19-21	50%	50%	40%
	Murkrow	20	-	-	20%

Pearl
Pokémon		Level	Morn.	Day	Night
	Zubat	20,21	40%	40%	30%
	Golbat	21-23	10%	10%	10%
	Gastly	19-21	50%	50%	40%
	Misdreavus	20	-	-	20%

Platinum
Pokémon		Level	Morn.	Day	Night
	Zubat	19-21	30%	30%	30%
	Golbat	22	10%	10%	10%
	Gastly	19-21	60%	60%	40%
	Duskull	19-21	-	-	20%