u/Beneficial_Option_87

I am playing in expert mode. In a canonical way I start with a beedril to set toxic spikes and sometimes I manage to put sticky webs on the ground with a charjabug. Nonetheless my Trevenant cannot outspeed Mel's Pokémon so I can't use hex to knock 'em down. I already used a link Stone so I can't afford any Gengar. Any tips or kind soul who would like to help me out?