you neeeeeed to max out twins since this is what really gives the deck steam. also since you only play two, theres a chance of prizing both cards which would make this deck basically unplayable. 8 psychic is too few also since late game energy drops are essential too with this deck. max out mews too.
If you are not experienced enough to write your own list I suggest buying a theme deck.
Pokemon - 18
3-2-3 Gengar Prime
4 Mime Jr.
2-2 Slowking HGSS
1 Mr. Mime
1 Spiritomb
1 Tyrogue
T/S/S - 29
4 Twins
4 Seeker
4 PONT
3 Collector
2 Juniper
3 Communication
3 Dual Ball
2 Lost Remover
2 Junk Arm
2 Lost World
Energy - 13
12 Psychic
That's my Lostgar list I use for testing, has worked extremely well. 4-4 Seeker/Twins is the play IMO.