No
the whole entire ruins
There are no Sinnoh ruins in the entire pokemon world. If you mean the Solaceon Ruins in Sinnoh, you can't go to sinnoh in HGSS. If you mean the Ruins of Alph, they're between Routes 32 and 36.
by going through it
try going through all the entrances in the little ruins and when you go in there will be a different way out
You get it by going into the Solaceon Ruins. The directions are written on the wall by the unown.
you meet Cynthia by going to the sinjo ruins (show an arceus to the president at the ruins of alph) and she will help you get a sinnoh legendary egg (Palkia, Dialga, or Giratina) amd then the unown will warp you back to the ruins.
the pokeball at the ruins is the hm defog the ruin manaic guy you see when you are going to veilstone in that cave who races you will build a long path that leads to it
You can get kabuto by going to the ruins of alph and break rocks thier.
emotional appeal
i am not sure what question is but try going to tanoby key( little cave before ruins) and push boulders into the slots. that will make unowns appear
the only way to get unown is by going into solaceon ruins
You get it by going to cornelis ruins and fight the golem there not the gargoyle