Is this a good pokemon team?

Hi iv been playing pokemon soul silver for about 2 weeks now and I just wanted to kno if this was a good team or not so this is what I got 1. Charizard lvl 51 2.swampert lvl 50 3. Mewtwo lvl 74 4. Groudon lvl 51 5. Electivire lvl 74 and 6. Magmortar lvl 72 and plz no rude comments just positve ones:)