I ended up not managing without the Exp Share. At around the point of the second gym, the level curve increases drastically making you lag behind significantly, forcing you to waste your time training.
It's irritating how long battles seem to take in this game; trainer pokémon always seem to want to stall you. A Psychic on Route 11 has a Solosis which took me 10 minutes to beat, until I decided to use Tyrunt, despite him probably not being a permanent member of the team. However, considering his usefulness, I think I might not bother with an Electric type and just teach Kirlia an Electric move (probably Thunderbolt).
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