i dont have a grass type on my team, so i was wondering if this is a good choice
unless it has sun support no psychic, ice beam, Shadowball and calm mind are good choices as is air slash
Well, depends on the rest of your team. Sigilyph has a high spec. attack, but solarbeam is a two turn move. If one of your pokemon has sunny day i would suggest it.
Like said before, the only reason you'd want it is if one of your Pokemon have sunny Day. My strategy is to have a Fire type with fLamethrower and Sunny Day and then swithch into the SolarBeam Pok3emon, bur since your using Sigilyph, SolarBeam is not STAB (Not forgetting its a two-turn move)...
However, it Covers its Rock weakness, but Id prefer energy ball for that.
My Sigilyph has energy ball but if I had a sun supporter every pokémon in my team would have solarbeam.