meganium: my least favorite starter evolution lol but ok it's fine.
umbreon/espeon: espeon is better than umbreon in general. umbreon has lower attack and better defense, but isn't really a defensive pokemon because it's not that much higher. plus with the lower attacks, and the fact that it doesn't learn any good dark moves really (STAB) make it pretty weak.
>> espeon however has high sp atk and speed so you'll be able to attack quickly and strongly enough for the lower defenses not to be any problem (ie making the opposing pokemon faint before it ever gets to attack you).
so I'd say espeon
starmie/lapras: well you already have a sp. attacking psychic type on your team (espeon) so it's kind of a waste to put it in. if you put lapras in, you'll gain an ice type to your team and, like you said, it's a tank so you'll gain that too. good for switching in during battle and such when you need to switch and don't want the one you're switching to to be instantly killed. you can base your movesets for your team accordingly. so I'd say lapras
ampharos: sure why not.
fearow: that's a tough flying type. it's very fast, and has very good attack, which, as said above, makes a very good combination, but dodrio seems to be better. even better attack, and slightly better defense, too. I'd say go with dodrio instead of fearow.
arcanine: well houndoom is good too. they're both good pokemon. arcanine has slightly better stats, like defenses and...well that pretty much it, but houndoom has the advantage of being dark-typed. that makes it immune to psychic, but also weak against fighting. well, arcanine is generally more powerful but houndoom just as good if you want to get it. but houndour is on route 7 (kanto)... there's always trade though!
for heracross: it's mainly fighting, so having one on your team would be good against normal, rock, steel, ice, and dark. arcanine covers ice and steel, and lapras/maganium covers rock. but normal and dark you have nothing super effective against.
- you can take out maganium. the types that grass is super-effective against are covered by other types on your team. so it really has no advantage besides being your starter who you love. note that meganium has high defenses while heracross has really high attack power. choose which one you want for your battle style.
- you can't take out espeon. too many type advantages lost if you did
- same with lapras
- you could take out ampharos. flying is covered by lapras and water would be covered by meganium. those are the two types electric is supereffective against. this would be better than meganium...
- if you took out houndoom/arcanine that would mean...well, nothing. everything is covered. but fire is good and these pokemon are powerful...
- flying...supereffective against fighting, grass, and bug. these are covered already. flying isn't really that good so this might be the one to take...
well, of the above, the best ones to take out for heracross would be ampharos or dodrio. dodrio has good atk and speed (good combo!) but ampharos has a better (sp)attack power (though bad speed...), better defenses, and better hp. also lapras is better with water than ice so if you were to take ampharos away you'd be losing strength anainst flying-types. I'd say take away dodrio.
FINAL TEAM:
- meganium
- espeon
- lapras
- ampharos
- heracross
- arcanine (or houndoom if you're willing to trade or wait till route 7 (kanto))
