I cant get to stark mountan?

Question

In Pokemon pearl I really wanted to catch heatran, but I cant get in stark mountan because the pathway is blocked. please help me

Answer 1

>The Pokémon is only available on the second visit to the mountain, after revisiting Buck's grandfather's house in the Survival Area.

First you have to do that, and on order to go to the Survival area you have to complete the Sinnoh Pokedex.

>Survival Area (Japanese: サバイバルエリア Survival Area) is an area in northern Sinnoh accessible after completing the Sinnoh Pokédex.

Sources: Stark mtn. Bulba, Survival area Bulba

Answer 2

depending on where you are depends on why you cant get through here is a video that shows you how to get inside and to stark mountain hope it helps
https://www.youtube.com/watch?v=WS-cmsHrIvI