http://i.imgur.com/nsHoHaf.png
Any suggestions?

Another thing bad about XY were some of the Gym Leaders terrible teams.

Grant for example only having a Tyrunt and Amaura. Ramos was pretty terrible too aside from Gogoat.

Gym teams have always been rather garbage. Really, the champion only having 5 and the E4 having 4 Pokemon is what bothered me.

Compare Grant to the other 2nd Gym Leaders. Only Brawly and Roxie had a team as lackluster as his.

Misty had Starmie
Bugsy had Scyther
Gardenia had Roserade
Lenora had Watchog with a very deadly attack for that early in the game

Recent generations, yes. But I had Silver (Original), and some of the original Johto Gym Leaders, in particular Falkner, Whitney and Jasmine, were PURE HELL to beat.

Don't Electric,Fighting and Psychic types destroy their whole team?

You couldn't catch any electric types before battling Falkner in GSC. I don't know why you would use a Psychic type against any of them either.

And another thing that I regret was choosing Chikorita as my starter Pokémon.

Now every game I always choose the Water-Type Starters.

Doesn't Jasmine use Poison types?

Jasmine is Steel. Janine was the Poison Gym Leader in GSC in Kanto.